I must be twisted because a part of me thinks well Rick and co you guys deserve this. Also I think it's a lose lose for gimple no matter who they chose he's going to get backlash. Cliffhanger or no cliffhanger whenever he decides to stop the scene they'll be backlash so if I was him I'd end it how I want also.
But why is this how he wanted it? For me this massively devalues the entrance of the biggest villain and one of the biggest characters in the show. Massively. Imagine he picks out Glenn like in the comics and we end with a shot of Glenn's horrible bashed-in head on the floor before panning to the rest of our distraught guys. Boom. You've got 6 months to process how this guy is the real fucking deal.
As it ends now? Fucking Sasha and Aaron are in the line-up, it could be one of them. So instead of spending 6 months thinking how much of an evil fucker Negan is for killing an original character you've gotta spend 6 months playing the guessing game. A guessing game which will be prematurely ended when filming starts.
If they wanted a cliffhanger ending then they should have changed a few things and made the final line-up Glenn, Rick, Daryl and Maggie. Then you've got the cliffhanger but you KNOW he's just brutally murdered an incredibly popular character.
Idk man, the whole thing is kinda baffling to me.