People probably thought the same thing about Anfernee Hardaway (4x All-Star, 3x All-NBA), Gilbert Arenas (3x All-Star, 3x All-NBA), Brandon Roy (3x All-Star, 2x All-NBA), and countless others.
Can't take the future for granted, or think a short career is that special in the broad scheme of things.
He's on a solid path though.
Good points, especially Penny--can you imagine if he'd been injury free?
Speaking of Penny, I promise every video I see of him, every comment I read about him on different sites or every person that I know of who speaks about Penny says the same thing you posted.
I think he's one of the only players that everyone has the same comment when they speak of his talents and his potential.
To the OP, I think he can be one but he's not there yet.
He has to prove himself a bit more but what he's accomplished in his 6 years have been amazing. I hope this injury doesn't affect him in the future because I really enjoy watching Rondo especially when he's on or in playoff mode.