The cast of 'The Big Bang Theory' filmed their last episode on April 30. After 12 seasons and nearly 280 episodes, โThe Big Bang Theoryโ is about to bid viewers a big farewell. And as is customary with any major hit, that raises questions about when โ or whether โ another network sitcom will blow up this way again. Chuck Lorre, who co-created the show with Bill Prady, has at times seemed like heโs single-handedly keeping the traditional multi-camera sitcom alive. In addition to producing โTwo and a Half Men,โ another huge hit for CBS, his credits include the returning โMom,โ as well as earlier shows like โCybillโ and โDharma & Greg.โMore recently, however, Lorre has migrated into single-camera comedies, including the โBig Bangโ spinoff โYoung Sheldonโ โ already renewed by CBS for two more seasons โ and โThe Kominsky Method,โ the Michael Douglas-Alan Arkin comedy for Netflix, which earned the producer a Golden Globe Award in January.Despite his experimentation wit...