Ditch the Starkiller Base superweapon. It wasn’t needed whatsoever. Instead make Starkiller Base a plain old military base that doesn’t get destroyed.
THIS. I feel the same exact way. The plot still works if you take out the damn superweapon as Kylo kidnaps Rey and they have to go rescue her. The only thing that doesn’t happen is the destruction of the utterly pointless Hosnian system. Just have one roundtable scene touching on the New Republic’s efforts to establish a permanent base, or just don’t blow up the New Republic at all, whatever.
No superweapon would make TFA much, much more enjoyable IMO. I thought it was great besides that.