I think it will be made, but as a straight to video/dvd flick with totally new cast (well, maybe Dan will pop up for a while) just like Dragonheart2, Mimic 2, Anaconda 2 and Starship Troopers 2.
Remeber who said it first.
There's a trend in Sony (among other studios) of doing such sequels from their old hits catalogue.
And - paradoxally - Bill Murray will more likely agree for GB: Nex Gen, than Back-in-saddle stunt.
I know most of fans would like to see old guys even if they're old, fat and grumpy (just kidding..they're young, thin and handsome…in our memories and hearts)
I wonder would You guys agree for such a sequel.