As for those not liking his new storylines; you did read the part where those stories will be finished as he intended? The only thing he's not going to be doing is writing the actual scripts. The stories will still be his.
Personally, I kinda hope the first issue of Chris Roberson's Superman
begins with Superman saying, "Fuck this walking shit. I could be home in Metropolis having some nookie with my wife." Whereupon he flies back to Metropolis and this "Grounded" nonsense comes to an end.