They all had pretty successful careers after TMTMS went off the air. Why do you think that is? I look back to other sitcoms of the 60's & 70's and most were typecast and really didn't appear in anything else, while the cast of MTM continued to flourish years and years later.

http://static.oprah.com/images/tows/200805/20080523/20080523_bts_101_350x263.jpg