I am not with increasing the block size, that was just a one-time incident and it's very rare for pools of transactions to accumulate like that, normally my even small transactions doesn't need more than one or two blocks to confirm. I think the current system already proved it's efficiency overtime. No need for a very big change currently.
If a mega merchant as Amazon is accepting Bitcoin as payment option, then all blocks will be full nearly instantly. That might be a reason for them NOT to accept Bitcoin payments as 1MB is simply not enough. 2MB is what we need if we want to attract mega merchants.