how important are we in the scheme of things?

well lets see ... if we divide 3,000,000 by 5,000,000,000 and then multiply by 100 we get 0.06% .. thats the percentage of time since Earth was formed that we have been around !

would we be missed if we disappeared tomorrow?

we should all strive to be more Iron like. everthing else in the universe is trying to become like it!