It does seem very strange that knowing Dallas was ending by the time of the last episode no attempt was made to resolve what had happened to Pam. We know Victoria Principal had turned down the offer to return for the finale as there was no guarantee it was the end. But surely by the time of filming and with so many old faces returning everybody knew it WAS the end. So even If Victoria didn’t come back, wouldn’t it have made a more effective ending to the series for Bobby to get a phone call at the end. It’s Pam (offscreen) and she wants to meet him at a gas station nearby. Just something like that. So at least in part there’s ‘some’ resolution. Even with the reunion movies no attempt was made to address the biggest issue fans had with the show - what happened with Pam. We had to wait 20 years for TNT.