[synth3tk]

I'm not long-winded like everyone else here (not necessarily a bad thing!) but here's my 2-cents:

Five students is technically a team. Is it more than one person working together to get a set goal done? Yes. Is it the amount of students that you'd like? Probably not. But it is still a team.
I'm sure most of the people who've responded here have large teams because of the advice they're giving you here. Obviously something worked with their team, so I would jump at the chance to take up their words of wisdom.

I think it was two years ago, at the Buckeye regional, they introduced a team that was so inspirational. You want to know how they got started years before? One really interested student got help from one teacher. That was the team for that season. He learned how to code in LabVIEW, he did most of the machining, he essentially was the team. I don't remember which number it is, or how many member they have now, but he certainly didn't give up.

Take the time to think about the positive side-effects of keeping this team around. Just one of those should far out-weigh any number of "advantages" you may find in removing the team.