...I'm pretty sure this is a competitive team.
Mics aren't exactly required for some classes. Pyro's a pretty good example of one that doesn't exactly need one. It's definitely preferred and someone with a mic and similar talent for Pyro will probably be picked over someone with the same talent without a mic because they can actually convey important information.
Edit: I'd also like to ask the people who want to play Soldier, what day and time would work out best for you? This would have to be a separate day from Scout as the time period tied in with the sheer amount of people willing to be Scout makes it unfeasible to have it right after. I was thinking some time Saturday if all/most of the Soldiers are free that day.