The infrastructure to support a product like this just isn't there, at least outside the South East.
I'm not thinking of stored value cards (eg Oyster or equivalent) which require readers to scan in and out at every station (although those are being rolled out beyond the big cities). m-tickets or e-tickets will do the trick, requires a smart phone and a mobile signal (or download as pdf). Guards have the ability to scan such tickets in many places (not sure if every guard on every TOC yet). Whether you offer the cardboard version is debateable, perhaps the 'deal' for having a well priced product available is that it is only available electronically.
The risk, as with any e-product, is if the guard doesn't come round and check, and the user doesn't activate the ticket, they get a free ride. Handing out only 480 singles instead of the standard season offering unlimited journeys 24/7 will compensate for part of that loss, that is, the buyer of 480 singles instead of an annual season loses the ability to make multiple journeys on the same day (without using up another single ticket) and the same loss of benefit at weekends. I'm not sure what proportion of season ticket holders use their ticket beyond a standard 5 out and 5 return trips per week. I'm thinking of point-to-point seasons, not zonal products (travelcards) here.
There will, I assume, need to be some software development to allow the sale and storage of that volume of tickets rather than a handful, perhaps to allow a total number of tickets paid for to decrement with each use, perhaps 480 individually numbered tickets which, once user-activated expire after an amount of time has elapsed. Reader software used by guards will need to feedback to a central database.
In terms of availability, I would envisage them being made available on the same method of calculation as current season tickets, not just an annual version, so:
Monthly - x single tickets for the cost of a monthly season, but valid for 3 months
Quarterly - y tickets, valid for 9 months
Half-year - z tickets, valid for 18 months.
Essentially if you were to travel one day in three, whether evenly spread or bunched in blocks, you would use up the tickets purchased before their expiry.