I asked TVshowsondvd .com's facebook page last night if we'll ever see Fresh Prince seasons 5 and 6 ever and got this respond from them.
TVSHOWSONDVD.COM Facebook page.
''Sorry Antione. this is one that i actually plan to put on our ''what's the hold up? faq at some point in the near future. Like American Dreams and Crossing Jordan and WKRP (all ready mentioned there). the hold up is music cost vs sales of already released sets. The most recent Fresh Prince seasons didn't sell well enough to cover the cost of licensing music for the next releases. We know the studio would prefer to finish it off (it's WILL SMITH, after all). they haven't figured out a way to make the numbers work yet,''