At least one of those problems has been solved as Independence Day 2 will indeed be bringing Goldblum back per Emmerich's twitter confirmation:
Excited to Officially announce @LiamHemsworth and #JeffGoldblum as the next two pieces of the #IndependenceDay sequel pic.twitter.com/GNuvffKWI3
— Roland Emmerich (@rolandemmerich) March 4, 2015
The idea of a Will Smith-less Independence Day still seems pretty silly, as does much of this endeavor, but I'll take my Goldblum where I can get him. Oh right, Liam Hemsworth...whatever.
Independence Day 2 is scheduled for June 24. 2016