The devs mentioned the problem of "kicking". Since kicking is an issue I would l also like to see a 100% penalty for booting members. Seems like a better solution than making it hard for small gulids to level.
I do solo things from time to time, but more commonly I short-man quests with others in the guild, join or create a pug or run with friends from various guilds. I tend to solo more in the early mornings if I am up because there isn't usually many people on at that time. My guild has 8 it is not a solo guild