Keep the variety - much better marketing and ownership.
Or alternatively, it could be seen as more of a mish-mash and less consistency.
I'd support something like the situation under Sectorisation (e.g. in England, IC, "NSE", and PTE areas having their own livery, with everything else being classed "RR") but not the post-privatisation situation which, above all, gives an image of an incoherent and unintegrated system.
So now it is all going to happen any ideas anybody?
My personal choice would be the Swallow Livery for Inter City Trains as I always thought it was very smart, for Suburban Routes I really do not know but I did not like the Network South East Livery to be honest. In saying all that it is a new start so new ideas will be out there.
IC, NSE and RR, with local PTE liveries would probably be my choice, as stated above. Plus Welsh and Scottish national liveries for "domestic" services. Not necessarily the exact same colour schemes as then, but those divisions.
Worked in the late 80s / early 90s, so why not now?
I think one detail a lot of people aren't considering is that whatever livery comes is being designed for completely new generations. BR ended 30 years ago - it's not unreasonable to think that the people who would've commuted everyday on BR and remember what it was like without romanticising it are no longer commuting.
I don't think that's true.
If we focus on the back end of the Sectorisation era in particular:
Someone commuting into work in 1993 aged 25 would now be 56, almost 15 years from retirement (if we assume retirement age rises a little further and this generation ends up retiring at 70).
Someone commuting into school in 1993 aged 13 would now be 44, and a long long way from retirement.
What is the obsession with a unified livery - the rail blue days were grim.
A unified livery stinks of a distant government imposition, with a whiff of communism.
Communism?
For my first three or four years of school commuting it was the "blue and grey" era, and as far as I am aware I didn't end up wanting to sell my soul to the Soviet Union.
(That said, I'd go with an updated version of NSE, IC and RR myself, simply because from the late 80s onwards I tended to prefer those aesthetics).