Yeah, that's why I was really upset at first since it's like giving 1 solo per season in the end. The chance of her appearing again in Season 5 after New Directions is almost 0, and in Season 6 she might not even return, and even if she does, she'll probably get the Mike treatment.
Yeah, I didn't mind but so much wasted potential. Breakaway and Jumpin Jumpin could've been a Tina's solo, but oh well, at least she lead in both those songs :)