If you are staying on a 1MB chain when the fork happens, why do you care what the bandwidth requirements will be when they won't affect you?
On my side, I care because I hope a better fork proposal will arise, and I care because if Bitcoin explode in two big parts, it will be a hard strike on it.
By the way, I think that "pro" are nowhere near 95% of hashrate supporting the fork, why are you so sure it will happens ?
Pros need 95% to change, anti needs 5%, so it's up to pro forks to have a proposal that gather 95% favorable opinion.
If no one change their minds, nothing will happen (And I think something should happens, but not this)
Because one way or another, the 1MB limit has to go:
Your options are pretty limited at this point:
Outcome 1: We fork to the 20MB chain and you're left behind on the old chain to run all your own nodes and do all your own mining.
Outcome 2: The fork doesn't happen, people's transactions stop confirming when the blocks are full and everyone jumps ship to something that actually works. You're left behind to run all your own nodes and do all your own mining.
Either way, you need to face that fact that we're not sticking around to entertain your rather silly desire to support something that isn't in our benefit. You can either tag along with us and play ball, or you can act up like some errant child. It's all a question of how big a scene you want to make. Either the 1MB limit goes, or we do. Choose wisely.
If you're proposing an "Outcome 3", then whatever it involves needs to be ready and functional before the inevitable Outcome 2 happens. If blocks are full and people are left waiting for transactions to go through, all other arguments are irrelevant. This is simple cause and effect. Full blocks means people jump ship to something that will confirm their transaction. Bitcoin becomes an elitist niche, some other coin will go mainstream and everyone will mine that instead.
People have discussed sidechains and pruning and other suggestions, but the fact is, they will take time to implement to make sure they actually work. A 20MB blocksize is a far more simple solution that will work right now and until I hear something better, that's the one I'll be supporting.