Let us not forget the Wizz A321s have 230 seats compared to Ryanair B737s with 189 providing of course there are no empty seats.
So thats roughly 20% extra passengers, 20% of 25m = 5m = 30m turnarounds for an A321.
Getting there, slowly, but surely. Why not try follow in the likes of the 'Leisure Loco's'. LS for example with their 235 seat B752's, allow between 50-60 mins for a turnaround. It provides much more breathing room for the pax and probably doesn't cost them 'that much more' to wait around
But as always it's a race to the bottom and I agree with Tango, it's only a matter of time before something serious happens