I will put money on it that the AC/DC pinnys will stay in the top 10 forever. They are both that good.

500 LE sold to 500 happy owners.
almost 2000 Pro models sold to date
1200 Premium sold to date
*(scource for data = stern)

thats apx 3700 happy owners.

also, the Pro model and the Premium models were widely available to play before people put money down on them.
alot of switched on ac/dc buyers obviously saw something great in the pro and premium models after a test of the gameplay.

definately all 3 titles will stay in the top 10 for a very long time. they may slip if stern come up with a killer of a new design in the next 24 months but the ac/dc titles will be and will stay successful/very highly rated for many years ahead.