I'm now going to switch back to "BIP101/XT died for our sins", because it will be clear that it did, should the block size increase.
Nope, block sizes are dead certain to increase at some point and they always were. But if you feel better believing in the tooth fairy, feel free.
A Pre-emptive strike!
Yes they are, and if you want to believe that mike, gavin, XT and BIP101 had nothing to do with making that happen sooner rather than later, then feel free.
Either way it doesn't matter, provided the increase happens in time to ensure that block size can grow naturally, then everyone is happy right? We all win right?