So you'd prefer to waste (and make no mistake, we've seen enough of Cappy - it would be an absolute waste) a year in which we have potentially the best roster in the clubs history? Based on what, the idea of a coach that might come a year later, but also might not (and which coach might that be)?
No.
There is an element of timeliness here, thanks to the cyclical nature of the competition (via the salary cap effect). Failing to take advantage of opportunity is criminal in the long term.
Cappy must go, and he needs to go now. Nobody should get away with complete failure over that long a time period and be allowed to continue. Even if it's for a rookie - at least they aren't proven failures, and some have pretty great track records (unlike Cappy did when he was appointed).
I'd take either Brennan or the Walkers (would lean towards Walkers... they will likely change the NRL at some club.. why not us? the best coaches do things that are different at the time, which everyone later copies.. Bellamy's defensive techniques and structures, Hasler's block play based attack etc), though Toovey would be my first choice since he has never been the type to put up with crap.