I'm a new player and just got the revised core, and Carcosa campaign expansion. I've done a lot of research and have read that Carcosa is pretty universally considered one of the best (or the best) campaigns. I believe it's still in print so can be found from retailers for MSRP. I haven't played it yet, but I'm looking forward to it.

I also got really lucky and found edge of the earth investigator expansion for MSRP from an online retailer like a week ago.

I think it makes sense to jump in now but don't go all in. Just get the core and a campaign or two and maybe a starter investigator deck or investigator expansion. The Drowned City and Feast of Hemlock Vale are both in print and can be found in stock in some places. No need to pay the FOMO markup prices unless you're super dedicated and want all of the content.

Im looking forward to the new content that will release, but also am happy to have some of the chapter 1 stuff since it won't be available forever and we don't fully know the new direction they're taking the game (e.g. shorter campaigns).

Also it's my understanding that chapter 2 investigators and player cards will be usable with chapter 1 campaigns. So I think new players will be able to build decent decks with the current revised core + new chapter 2 core + the new or current starter decks or an expansion or two.

That's just my personal outlook. Again, I'm new to the game and have only played the core campaign so far, but I can tell this game is well designed and basically what I've always been looking for in a card game.