Remake should require only one vote

Better answer: Anyone who votes "yes" to remake should be immediately booted from game as per the current remake rules (ie. no LP loss). Person who calls the remake vote is (obviously) instantly booted out (so you KNOW you're losing at LEAST that guy). That way, no one needs to play a "bad game" if they don't want to simply because other people want to give it a go. If Riot wants to be "good" they could also give "bonus LP" to anyone who stays. (so if you win, you get an extra boost since your team was down X number of players)

And it should be removed from any non-ranked queue

Remake timer should be extended to 4 minutes

I agree on the grounds that as an adc player, I've been forced to stay in games where my support is gone but the rest of the team likes their lanes so they vote no and then flame me for losing 1v2 bot lane.

It's a team decision. If they wanted to ignore the disadvantage of a missing teammate, then that's their choice. They're your friends, so you can try to talk them out of it.