As I have mentioned before, I an not wholly convinced by competition, I think that there are advantages to a universal operator if they are required to provide public as well as commercial services, but right now E* is a monopoly which only provides a limited range of services that it considers commercially viable. You would hope that competition could grow the market. The danger is that whilst new operators will force E* to up its game with additional stops at Ashford, etc, the smaller operators will be forced out of the market and we could be back to square one. Time will tell. I certainly can't see SNCF co-operating with the new operators when it owns much of E*. Having two long distance brands doesn't help. OuiGo is not designed for connections so you would have to rely on InOui or Lyria. (I still can't see why you don't have both brands in the same train but I obviously think along different lines to SNCF.)
In an ideal world yes, but from a European Commission's point of view, when faced with organisations like SNCF and RENFE who'll never change their antiquated, protectionist and inward looking ways, relying on the market is the only way to harmonise the European rail operating environment and lower barriers to international services. What you want is basically
A) Track access becoming a matter of simple commercial transitions (of course heavily regulated, in terms of safety and timetable structure integrity etc, but the process needs to be transparent, fair and consistent), rather than subject to opaque tit-for-tat between protectionist national entities
B) International services being able to serve domestic demand on a fair basis regardless or who runs the trains so that those trains can wash their face (there are still too many cases of European International trains being pick-up and set-down only when not being in their 'home' countries despite relatively low frequencies in the domestic offer)
Fourth Railway Package rules applying to all railway operations are the only way of achieving those goals. Competition doesn't prevent national authorities from specifying comprehensive PSO contracts - when you have a good timetable Open Access either can't compete or they become part of the timetable. There are only a handful of competent railway authorities across the entire Europe - The Swiss, Dutch, Austrian, and Belgian, and that's pretty much it. The European Commission can't compel all national governments to 'just be competent'.
Especially with Britain being out of the EU, the prospect of a multi-government authority specifying a Eurostar PSO is pretty much non-existent. Theoretically, I do think that if all non-railway barriers were removed (by that I mean UK joining Schengen) then the unsuppressed market would be something like
- 2tph London - Paris
- 2tph London - Brussels (arriving Brussels xx13/43)
- 2tph Paris - Brussels (arriving Brussels xx17/47)
- 2tph Brussels - Amsterdam (departing Brussels xx22/52)
- 2tph Brussels - Cologne (departing Brussels xx25/55)
With the London and Paris trains alternating between going direct to Amsterdam and Cologne.
There's no condition for setting up such an authority and such a PSO, so the next best thing is for the market to provide a bastadardised version of that. The domestic railway cultures of the UK, Belgium and the Netherlands are such that Open Access paths settle into standard patterns anyway (I didn't invent those arrival/departure times above - they are an evolution of what you observe with trains that run currently, just not consistently every hour) - you can see the same thing happening in Italy. Looking at Italy and Spain you do see the market gravitating towards greater supply and lower profit margins, and hopefully the same is achieved on the Channel Tunnel corridor.
There is basically no stock available to run a lot more than is currently running. At the very least until TGV M is fully rolled out and cascades happen (but that won't solve anything really, 100 TGV M is puney especially when they send 15 of them to compete with themselves (Italo) in Italy and when there are retirements of single-level stock to deal with)
Of course there is a lead time for rolling stock orders (and that for the TGV M has been particularly long), but in the grand scheme of things this is a short term issue.
If you know the timetable you want to operate you order the number of trainsets for that timetable. As a railway operator you publicised your intended timetable in advance - towards the travelling public for developing your customer base and towards the industry so other operators can plan around you, taking into account various lead times (rolling stock order, track access, staff training etc). It seems this kind of railway culture is missing from SNCF. I'm seeing this culture displayed by the likes of Ilisto and Poxima.