I'm not sure if Apple would ever do this, but I'd expect they would just delay a April launch till the fall, as opposed to doing an April and a fall launch of to revisions in one year.
Ahhh... but see, the next iPad (iPad 2? iPad S?) is already being manufactured. No way would those be warehoused until September.
So you have a fairly imminent launch coming as I type this, and one that doesn't have a lot of people excited, if the leaks are accurate. I just can't see Apple waiting 18 some months to release another product.
Apple fans or not, that's not going to work.