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..
Maybe not exactly right now, but in the future we will need it. So ask yourself, what's better, to fork now while Bitcoin is still somewhat underground, or to fork when BTC is huge and all over the mainstream media on a daily basis? exactly.