I just started watching TBBT and I had the exact same thought, but your idea is genius I wish you would have kept writing this out, so Steve would be his boss? This sounds awesome

Family Still Matters
A continuation of the classic american sitcom Family Matters Created by William Bickley & Michael Warren, while also being a crossover with The Big Bang Theory Created by Chuck Lorre & Bill Prady.
Could be developed by CBS (who owns the rights to Family Matters), Chuck Lorre Productions (The Big Bang Theory, Two and a Half Men), and Warner Bros. Television.
Pitch Summary: 15 years after the original show, Steve & Laura Urkel move from their hometown of Chicago to Pasadena with their two teenage kids Stephanie & Stefan Jr, where Steve accepts a position as the new professor of Theoretical Physics at the California Institute of Technology aka Caltech (same workplace as the guys from The Big Bang Theory).

That would be funny. They cast can say, "you look familiar..".