Well this is one of my fears as well, last thing we need is divided community. Oh well, lets just hope this will end well!
It'll always be divided. One side just needs less divide than the other. The 1mb advocates will quickly put a sock in it when they're left with nothing while everyone else moves towards the future.
I would be very nice for this fork to be the final one, unlikely as that would be. It's still tiny enough to push something through but then again who knows what strains will come in the future?
I hate to think what a fork would look like five years down the line if there are tens of millions of people and businesses populating the scene.