We dont know the price though. Also not sure why you would even release DMC1 physically, they'd probably just do a trilogy release st that point.
The price of the trilogy in the PS Store is 30$, I doubt Capcom is going to go lower than that (remember the Ultra SFII HD release at 40$?). And besides, if their plan is to release each game individually and then release the trilogy in a retail pack, it's still incredibly underhanded considering the games are already made, porting games so old (and games that have a perfectly working PS360 version) is not hard at all. They would just be gauging Switch users once again.
I'm not sure your point actually makes any sense. You're saying that even in a hypothetical situation where the ports and collection are appropriately priced, where the collection is completely on cart, and where the ports run fine ... it's still gouging because ... the collection comes later? That doesn't make any sense to me. I mean, if the collection comes too late after the release of 3, yeah that would suck. But assuming it's just a few months after it, I don't see the harm. I also don't know how that would be "gouging", that's not even how the term is applied when it comes to consumers. It usually means to rip off. So if you yourself are using a hypothetical where the ports are appropriately priced, your own complaint doesn't make sense. This comes off as an incredible bias against a company rather than rational thinking. You could have just said that said hypothetical situation is unlikely, which it is, and have been done with it.
Releasing games as they become ready to release onto a platform is actually pretty common for retro games to be honest. Even the MCC collection on Steam is releasing the games individually before selling them as a collection. It's a way to get games on a platform without waiting for all of the games to be ready. And to be honest, I'm not too sure if the games having ran well on PS3 or 360 matters. The issue would never be if the Switch could handle it so much as optimizing it for the specific hardware of the Switch, which yes, even old games need to do.
Either way considering DMC5 just released and Capcom isn't going to put a lot of resources on a niche franchise like DMC, it sort of seems reasonable to assume they just started porting the games to Switch a few months ago. In which case it sort of makes sense to release them individually, shouldn't wait for all the DMC hype to die down to release the game.
I think a much better point would just be that the hypothetical best scenario you are using is just incredibly unlikely - which it is. However you shouldn't write a comment as if that information is as sure of a thing as say, Persona 5 on Switch.