At least you've learned to use the words "I believe" on these conjectures of yours.
But yeah, Jack did say he wouldn't ship incomplete software, but clearly developing an entire pinball platform turned into a far more time consuming ordeal. I note he hasn't made that claim in quite a while - probably well over a year.
In the end, I'm not as worried about a game merely coming out with incomplete software, as I am with an obviously incomplete game having erratic updates and no guarantee of eventual completion (see: almost every recent Stern). I expect programming work for WOZ to continue as top priority at JJP, and for updates to be frequent, until such time as Keith's happy and even jaded Pinsiders can declare it finished.
And if that's not the case... well, I'm sure there are plenty of non-WOZ owners who will be more than happy to gloat to all of Pinside about it!