Also, back on the subject of how on DALLAS, the whole Ewing family lived on Southfork vs how most of the Carringtons lived at the mansion.
While I haven't seen the entirety of DALLAS, I did think that DYNASTY managed to justify having their own family stick so close together - or at least, at times, they *could* have justified it. For example:
Alexis' studio gave her the perfect excuse to prowling around the mansion grounds, going in and out of the house and butting into the lives of her children, ex-husband and new rival. And what's more, Blake couldn't resort to more extreme measures to get her out, as he was on probation and already had the law breathing down his neck. Heck, I think they should have kept the studio around, as that would have provided excuses for other characters:
-Jeff and Kirby; once they got together, they definitely should have moved in Cecil's old mansion with Alexis, only for said mansion to burn down in the Season 3 finale. Afterwards, they move into Alexis' studio, with the justification being that Jeff wants to build his own mansion, so they have to wait for it to be built (except it never does, as he ends up changing his mind); plus, Jeff could further justify saying that he wants to keep his son closer to Fallon - which rubs Kirby the wrong way, but oh well.
-Caress; while I do like her flitting about Alexis' triplex apartment and demanding a place to stay, I would have had her do that simply as a way to get under her sister's skin. Once she's accomplished that, Caress then makes the brazen move into Alexis' studio, so that she can visit with Krystle and her nieces/nephews to get some new stories.
-Why, even Alexis herself could make the periodic visit to her old studio to "get away from it all" when really she's just there to drive Krystle up the wall again.
As for the other characters: of course Blake and Krystle are going to live there, and of course Fallon is, too, she's Daddy's Little Princess - as is Amanda. Adam is another natural inhabitant, as he's the firstborn son and wants to become Lord of the House once the time comes, so he might as well make his presence known. Sammy Jo would have all sorts of reasons to live there/visit (her marriage to Steven, her visiting Danny, her wanting to get close to Krystle for the "Rita" operation - and for this one, she'd use the Moldavian Massacre as justification for suddenly wanting to "reconcile" with her aunt).
In fact, the Moldavian Massacre would have been a perfect excuse for nearly everyone living at the mansion: after all, they all just survived a harrowing incident (or at least, let's pretend for this rewrite that it actually *was*, haha).
Plus, in the earlier seasons, a core trait of Steven was his desire to escape the world of the Carringtons, and for a while, he kinda did; even getting his own apartment. But I think he should have remained that way for Seasons 4 and 5, with him moving back into the mansion in Season 6. After all, not only did he just survive a massacre and would want to remain close to his family, he *also* finally reconciled with Blake, who finally proved that he genuinely accepted Steven for being gay - and I would have had that be done with Blake declaring that Luke (who, in this rewrite, did NOT die) would be taken back to the Carrington mansion and become one of them.
Claudia became basically a patient of the family in Season 2, and she had that whole "marriage of convenience" with Steven in Season 4... and... I'm gonna admit something: I actually don't hate her getting together with Adam.

Thus, Claudia would end up living at the mansion as a natural result. Only this time, Blake isn't all "You two betrayed Steven!" Instead, Blake's concern lies in the fact that Adam and Claudia are very obviously rebounding with each other, and not only is it inappropriate, it's also potentially dangerous... and he turns out to be right.
Oh yeah, and something else, just to add: with Jeff, at least when he and Fallon divorced again, even though he moved out and got his own apartment, he had plenty of good reasons to still come over: visiting his kids, helping out Blake, still being on friendly terms with Fallon... Yeah. With the Carringtons, *somehow* it all felt natural for everyone to be living in (or near) that great big house.