Exactly, Piababriella, that's what I think the line means:
(however) a few still choose to become teachers.
Something must have been said before giving a negative information about teaching life and the person completes the idea by saying that (surprisingly), a few still choose to become teachers.
I think this is just the second part of a sentence.
Of course I may be wrong, but that's what I understood.
You are right Lilian, there is no "there are" in the origin. Don't know why I wrote that. Anyway this is "meaning only" and I guess that the important thing is to find the right meaning, no matter what word we use.
Hm...I think that Piagabriella has found the way to put it, maybe with a "but" first. ?
"but (still) only a few choose to become teachers"