For the sake of monetary income they should.
Although I don't buy the whole 'we're getting less and less content per patch cycle' unless getting less dungeons bothers you (Hint: It really shouldn't. Individually they're 20 minutes of content not counting how many times you'll repeat them for seals at which they're identical and accomplishing the same goal). We're getting the same content in 4.1 as we saw in 3.1 except we're also getting a super savage tier fight who's only purpose is to give raiders who already cleared the raid a thing to do with a weapon that's effectively pretty sweet glamour.
XIV's problem isn't the fact that we're getting less content. The problem is we're getting the same content and we're burning out on it faster because most of us have done this for the last 4 years. If this were 3.0 we'd be waiting another month for the patch to drop lol.