Let's be honest: Most people probably like DOA because of the girls and the outfits (the ones putting money into the game, especially.) At a certain point, it's smart to lean into your selling points if for no other reason than that they are selling points.
And gameplay. If I was only here for the girls and outfits there are better and cheaper games out there.
I have no doubt they'll continue to come up with ways to make DLC/make money. If the gameplay sucks and no one is playing, neither will I. I'm honestly surprised I can still fairly easily get online matches while I am doing arcade runs.