Derr.
Because these are the final chapters of Lucas's story. JJ was hired to do the master's bidding.
The superfluous spin-off films will be for directors chosen for their individual quirks.
Interesting.
Title would be nice.
Abrams is really good at remixing/appropriating things. He's not as BLATANT about it as Tarantino, who makes that part of the appeal - "Look at what I'm remixing. I'm fucking GREAT at it, aren't I?" but he definitely looks at why the property works, goes into that properties past, and mines moments/visual cues/filmmaking styles, and updates them for his own storytelling purposes.
So if you want someone to do a Lucas impersonation - get the guy who is pretty good at doing a Spielberg impersonation already, and have him shift the couple steps sideways.
The spinoffs will be stylistically riskier, yes. In fact, I'm betting the Zack Snyder doing a Seven Samurai remake set in the Star Wars universe is still happening, and will be the movie he directs after Man of Steel 2 - leaving Man of Steel 3/Justice League to Affleck.