The only way I would walk away is if the game reverted to 4E. That is the reason I quit Pathfinder 2
PF2 is a game with almost no similarities, rules-wise, to 4E, whereas it has a ton of similarities to 5E, so this seems like a rather bizarre thing to say. What is it about PF2's design you actually disliked?
Re: what would make me stop from switching, I think a lot of things could, but two key ones:
1) Pricing - if they make it expensive enough, and it kind of looks like they're going that way, even relatively well-off people like me may stop feeling like we're getting value for money. Like £70.99 for Planescape? I'd expect something amazing for that, and what we're getting is not anything amazing. If we continue with similar price/value ratios for 5E 2024, I can't see myself buying into that, even digitally (as digital costs have gone up a ton too). I'd rather see better prices and less glossy production values - it feels like WotC - or perhaps Hasbro is more relevant here - are continuing to try and sell D&D more as collector's items than an actual game people actually play. I have no objection to collector's item editions etc. also existing, but when the main product is edging that way? Not great.
2) Fundamentally consumer-hostile approaches to future content - Not sure how to describe this perfectly but, stuff like having a lot of digital-only material, or 3D VTT-only material, having any mechanical material that's locked behind subcriptions (rather than being purchasable outside those), or worse having mechanical (or setting) material that's available only through things like loot boxes or other lotteries. There's a pretty clear and bright line here, I'd say, and companies absolutely know when they're crossing it - but greed often causes them to cross it anyway. If we're lucky, they cross it experimentally, and the blowback causes them to back off, but if we're unlucky, they simply cross the rubicon and you can't have X race in your game unless you subscribe, and your players can only access Y Fighter subclass if they open enough loot boxes. Also that epic new setting and adventure that came out, it's only for people on the $20/month tier of the 3D VTT, not peasants like you.
At that point, it's like, these TT RPGs mate, not some super-hot MMO, I can go play/run something else.