right now 1mb has a yearly potential of 52gb.. its been long enough now and we are at no where near 52gb for the total of 6 years. so i see very little reason to increase the blocksize right now.. if anything we should be coaxing the pools to stop delaying adding transactions and to actually start filling all blocks with tx's as they happen..
Raising blocksize causes another problem that is near 52gb blockchain data. Downloanding the whole chunk of blockchain takes a lot time and and hard disk space. No many ppl are patient and persistent enough to use the bitcoin qt.