Short and literal answer: yes, we could still live without football. We don't depend on 22 men kicking a ball around a field to live.
More general answer: tonnes of men don't like football, so it would be a blatant exaggeration to say otherwise, but many would be sad to see it go. Though we'd probably just pick another sport to glorify, tbh.
I already do, I use my time to take interest in much more interesting things. It exists independent of people you know... People only find it interesting because it's something everyone else seems to find interesting.
No, i tweet about something football related every day. I play + train every week. And i'm constantly reading up on it on news sites etc.
I've made a lot of friends through football, so i think its very important to me! and therefore i don't think i could live without it! :/