It's too early to say what level Irving can reach, he only played two and a half seasons. I somehow feel he's not giving 100% this year because he wants to play more games and avoid injury.
To some extent Irving reminds me of a young Kobe, he's questioned not for his talent and potential, but more for the attitude and maturity. With the right coach and teammates I believe he can take his game to the next level.
I'd trade Rondo + a 2014 first round pick for him.