I thought Tellus was a good addition because of his unique look. His powers duplicated Saturn Girls' who had left the team, so there wasn't much need for him when Imra was on the team. But she wasn't around in the Giffen reboot, but we already stated how Giffen and the Bierbaums were only interested in some of the Silver Age characters (really a select few). Tellus was part of the New 52 Legion Lost. I think there is place for him if the classic Legion returns. If we're stuck with Bendis Legion, I doubt he'll be back.