Trouble is, if you were lucky enough to be allowed to buy an FLF then you're probably going to want to be able to buy the next hypercar in 2025, as well as the first 488, and the new FF, and the new F12, and then the 488S, and so on and so forth. That's a lot of awesome car to miss out on just so you can get 15mins on TG. Personally, if it were me, I'd probably do the exact same thing.
McLaren are just being pussies though. I say let Ferrari turn up with the gear (like they do for every single car launch ever), then let McLaren match it with all their super clever experts, and then just watch Porsche turn up and throw you the keys.
I know I'm biased, but I really can't see Porsche ever turning down a fair fight. If the 918 was slower at Silverstone as I suspect, they'd simply point out that they have the only hypercar that can travel on electric power only, or is 4WD for use in the snow, and anything else the PR department can come back with. Hell, they might even just point out the number of trophies in the cabinet, which is greater than both the other two. I just don't see them being as picky or precious: They just get determined. Look at how hard they chased the GT-R with the GT2RS and the new 991 cars after the Nissan p*ssed all over their Ring time!