I wouldn't be against Hypercar-only races but I'm not sure whether there's enough interest from the OEM side to put up a 25-30 car grid. On one hand there's the mandatory 2-car rule for next year, so there will be another Lambo and Caddy. On the other, Cadillac wasn't in a rush to go beyond the a single car in WEC (apart from Le Mans) while in the DPi area they were the ones with several customer cars (but ruled them out this time) and seemingly only BMW considers customer cars on any level beyond Porsche.
Looking at next year:
OEM entries:
Alpine - 2
Aston - 2 (if they come)
BMW - 2
Cadillac - 2
Ferrari - 2
Lambo - 2
Peugeot - 2
Porsche - 2
Toyota - 2
IF - 2 (if it comes through)
That's 20 entries out of 22 allotted. We'll have the #83 Ferrari and maybe the Proton 963.
I'm not sure what other OEM would be in play tbh. I don't trust McLaren, I believe more in Hyundai/Genesis than them and we have Acura/Honda, although I don't see them coming to WEC, either. If we discount IF but add the latter 2, that would be 22 OEM cars in 2026. Granted, I don't have the big picture of the industry and I'm not privy to any sort of information apart from what you can read on the big sportscar news sites, so my "analysis" is purely speculative and influenced by my personal bias. Nevertheless, I can't see a bigger grid without customer cars and I most definitely wouldn't limit the number of cars per OEM.
The FIA and ACO are so hellbent now in only giving slots to WEC participants and a select few invitees, plus the spec Oreca racing that we will never see stuff like the Le Mans-only GTE Pro field where the OEMs brought over their IMSA GTLM teams. I personally wouldn't mind if the 62 LM24 slots would be half HY, half GT3 if we could get some extra cars from IMSA or customer Hypercars, no matter the brand - same with GT3, the demand is clearly there and I wouldn't mind allowing the AMG GT3s, either. The whole loyalty thing stinks a bit for me.
PS: I'm not against LMP2 in general, it serves FIA and ACO very well, no question. However, given the current state of affairs and the grid limits, I wouldn't be opposed to boot them out of Le Mans for a while.