How about the possibility of CBS selling the home-entertainment rights to Happy Days to VEI Home Entertainment?
CBS Home Entertainment has a deal with VEI to license and release some of the CBS Distribution library. VEI has released Complete Series Collections of Barnaby Jones, Diagnosis: Murder, Sister, Sister, and The Parkers (the latter two of which were produced by Paramount TV), among others. If Paramount Home Entertainment is not willing to release Happy Days's remaining seasons on DVD, then what other option does CBS have? Although, I wouldn't mind Shout! Factory getting the DVD rights to Happy Days, either.
"When the run of a network TV show has ended, some go out with a bang, some with a whimper, but all are...Future Endeavored."