Don't get me wrong, I think we'll see way more Puscifer releases than Tool in the future. Maynard doesn't really have to wait on people for that, and he can just drop a single song or an EP here and there whenever he feels like it. He has the freedom to work whenever he feels like scheduling some studio time around the vineyard. With Tool and APC it's a collaborative effort, but I think he enjoys it when people have their shit together and are ready to get things done. I'm not saying another album is gonna happen soon, but I doubt this is the end of the whole thing. Adam, Danny and Justin surely will continue messing around and will eventually come up with something in their own time, and if they lock something in I'm sure Maynard doesn't mind having an alternate outlet for expression.
Maynard is mostly irritated at the constant hounding from fans, and I think the hounding is only exacerbated by the other three guys, for the last five years, saying "It's almost done" leading a lot of people to place the blame for the delays on Maynard. I've heard a lot of people saying the album is taking so long because Maynard is too busy in the vineyard or with Puscifer to make time for Tool, when it's the opposite. He's doing those things while waiting for the guys to finish something that he can record vocals to.
Remove all of that pressure, and the guys won't feel the need to constantly placate the fans by telling them something is almost done, and I think Maynard will be less irritable about the whole situation. I'm also sure for the rest of Maynard's days he's ALWAYS going to be asked about potential new Tool material in interviews, and after this album he can easily kill that question with "Not likely" instead of trying to explain why the process is taking so long. I have a a strong feeling none of the guys would answer that question with a definite no.
It honestly wouldn't bother me if this WAS the last album, but I have a hard time believing the passion that these guys have creating and playing together is just going to disappear as soon as the contract is fulfilled. I could also see them focusing on EP releases in the distant future where they don't have to crank out eight or nine songs at a time because they're contractually obligated to an LP. Tool releases will probably become WAY more leisurely in the future, but I don't think they'll stop altogether.