75% is often seen as a majority vote. If you are in the 25%, would you not consider it a fair vote and your view is in the minoirty? In any event, the level to be reached to achieve consensus is evidently the first thing that needs consensus.
I would not because Bitcoin is not a democracy.
Who knows what will happen, but as long as Bitcoin remains internet money, it will continue to evolve. Who knows, creating more capacity to expand its attractiveness may bring even more people into the development community.
Segwit offers an increase in capacity as well. Nothing special about the fork and 2 MB blocks. I do wonder what is going to happen though.
I'm reasonably sure segwit will end up needing a hard fork. How do you deal with nodes that fail to update? There will be differences in the data between full nodes. There is too much risk at the moment with the soft fork without more testing. It sounds feasible to soft fork, but....there is always a but.