More people visited the island all right, 9 brand new girls that we've never seen before in DOA History. The original DOA cast appearing in VV is very less likely due to VV Team seem more interested in added bunch of new characters, DOAXVV is pretty much similar to SFIII, Tekken 3, SCV etc. where we get bunch of new characters instead of veterans.
They already admitted in that Famitsu 2nd Anniversary coverage thing that the classic DOA girls are highly requested (that's even one of the reasons Leifang got added in), so it's still fairly likely the others will get in. Besides, after they screwed up DOA6 and most likely have put the fighting franchise out of commission for a while, this game is the classics' ONLY chance at a return at this point (well, that and maybe X3, depending on whether the new Switch-esque console item for the Owner Room is meant to tease an incoming Scarlet update or not).
Heck, the fact that the datamines listed Christie, Mila, and Rachel hints that at the very least, they DID consider adding them in at one point.
And I'm fairly certain we're going to get a LOT more than just 19 girls. I've been to resorts before such as Sandestin, Myrtle Beach, Gulf Shores (I think, anyways...), Mobile Bay, and even Lake Lanier, and I can tell you, those places house a LOT more than just 19 or even 25 people. And while I've never been to any island resorts (other than perhaps Gulf Shores), I do know that the Four Seasons resort in Bora Bora, for example, can house at LEAST a hundred people, and the island itself can house 899 people per square mile. And since the main point of the game, according to Misaki, is to build the ultimate resort, I'm pretty sure we'll need to reach over a thousand girls before we can even CONSIDER the game finished.