Well, it all depends on how good the next album will be IMO.
I'm still a bit shattered towards 10 000 days, Lateralus still remains their huge masterpiece, meanwhile i've never cared for Aenima or Undertow.
I know a lot of you praise Aenima, but i don't enjoy the vocals being buried under instrumental-parts i don't enjoy.
A good example of this would be Stinkfist, which i don't find anything good at all in, even though i can agree that the live-version was slightly better.
So looking at it from my PoV (only REALLY digging Lateralus in fully), 5 years between albums is a long time if you don't enjoy much of the stuff.
For those of you digging all of the discography, i totally get if you find a decade between albums worth it. :>