increase block size may injured bitcoin node ... because of the pollution of trading (high trading).
people that need speed ... must build sidechain (or offchain strategy like bitpay ou coinbase).
i don't agree to increase block size except if it has a limitation ... (like 10MB).
Time to embrace Open Transactions, Ripple, Stellar or whatever for offchain transactions.
Edit: I say go for it. Go for the 20mb blocks. I want to see what happens... Just hedge your bets.