As far as first-person, I can't find it right now, but I think somebody at Capcom implied that there were several different types of RE games in the works, and even implied RE8 wouldn't be first-person. RE7 did not meet their sales expectations, so that might make sense (although I think it would be a shame, as I consider RE7 a masterpiece). As for REmake 2, it began development before RE7 was released, and before Capcom could know how it would be received. I believe it's very likely that they intended for REmake 2 to be a traditional third-person RE in the event of poor reception of RE7.
As for RE2, you keep calling it an action game, but it isn't. The older RE games have combat mechanics, but they're very simplistic, and the focus of combat is more resource management. You don't have to aim at enemies; you just get to a good position and let lock-on do the rest. Combat is really all about which weapon and ammo type you want to use on which enemies. There's very little mechanical depth there, as the focus was on Survival and adventure elements, rather than action or combat, for the older games.
That's essentially what the older RE games are ; point and click adventure games (you literally walk around and check stuff for the majority of the games, plus solve cryptic puzzles) with an emphasis on survival elements such as item/ammo management, and of course horror elements (hence the term, "Survival Horror"). They weren't action games, and the focus wasn't actually placed on combat until RE4.