For don’t think this is being suggested. Rather I think the OP is suggesting a new regime that has fewer “perverse incentives”, here perceived as causing operators to game the system and run many small trains
I thought that the OP was talking about a world where the billions of pounds of fare revenue "all goes into one pot"
That would mean we had no idea how different lines/ services/stations were performing compared to others - whether the introduction of a different type of train had had an impact upon passenger numbers - whether introducing advanced tickets on a line had seen sufficient passengers paying the lower price to mean an overall gain in revenue - whether cuts to the First Class offering had turned more people away than expected - whether an improvement on one line had increased passenger numbers and revenue but partly by cannibalising journeys from a broadly parallel route - that kind of thing.
If we just put all of the money in "one pot" then we'd have no idea what works what didn't work and where lessons could be learned.
I'm sure that there are similar things to ORCATS in any large industry - supermarkets will want to know how their "local" stores are doing compared with their "hypermarkets" - they'll want to assess the revenue that comes in during the final hour of operation each day to assess whether it's worth opening later of closing earlier - they'll want to see whether the "three for two" offer saw a sufficient rise in consumer spend - whether an advertising campaign sees a boost to sales over the next fortnight - they even offer us discounts on "loyalty" cards so that they can collate this data, that's how important it is.
Having franchises run on a management contract (with no revenue incentives) is different to getting rid of ORCATS - I'm certainly against the trend of squeezing short DMUs through bottlenecks and would welcome a better balanced timetable rather than what we have on lines where competition has encouraged too many trains like York to Leeds - but you still need something like ORCATS to be able to manage where your income is coming from - even under a "monolith" operator you'd need statistics to evidence what worked/failed - if only so you could go to the Government and use the figures to justify why you thought investment in a particular line/station would pay off.
IMHO, ORCATS feels a bit like the data collected for delay attribution or the entire HS2 project or the original IEP - it's easy to pick holes in but a lot harder to come up with something better