1) What does Janet have to do with their performance? For that matter, why are you bringing up Fergie and Rhianna both of which are NOT known for dancing?
2) Considering Tina is old enough to be Beyonce's grandmother how can you possibly type Ms. Tina is going to slow B down? Be real, Tina evented it before B was even born. B even stated she was "inspired" by Tina so don't go there.
3) What has Beyonce done that is so ground breaking again as a SOLO artist? CD sales, no. Record sales, no. Performance, seen it before from innovators.

Be a fan, but don't be ridiculous.