Care to make a wager, iCEBREAKER? 1 BTC that the longest proof-of-work chain contains a block larger than 1 MB by this time next year (10-Jul-2016).
If you lose, I want real Bitcoin. If you win, expect to be paid in doublespent Gavincoins. 
Did you just agree to the bet? I can't tell.
We'd both deposit 1 BTC to a multisig address (3rd key held by neutral party). If the chain forks, the winner would automatically have coins spendable on both sides.