First rant in a little while, I'll keep it short and it'll still probably be horrible…
If you think about it, the whole reason why MCGamer is still here is because of the community. No one would be here if the community wasn't, because what's the point? Servers are meant to bring people in a game together to achieve something that benefits all of them.
So where does Solo SG lie in all of this? Well, teaming on MCSG is a fun way to connect with people, sure it doesn't help the other players win, but there's always another game, another time, another day.
With Solo SG, it takes out some of that community feeling that keeps every server alive, and that, is what I'm afraid of.