The UFC delivers on occasion. But, they will never fully deliver for many reasons. I won't repeat them here because I don't want to sound like a broken record.
To directly answer your question. The UFC does not care about bringing Rousey back to her full capacity, even if it were possible. All they care about now is a giant money making rematch.
They have two careers to juggle. First the champion Holly Holm. If Rousey does not fight her soon...very soon. She would have to take another fight to keep the fans happy. Now what do you suppose would happen if she took another fight before the Rousey rematch? Right...we don't know do we? And that is exactly what Dana White is worried about. The Great Manipulator loves to make sure in advance who is going to win for obvious reasons. She might Tate or someone else with really good wrestling and be taken to the ground and beaten. And we all know that would be the end of the big rematch so that's not going to happen. In fact, I predict that she will not fight anyone before the big rematch with Rhonda Rousey. Anyone care to bet me?
similarly what if Rhonda comes back and fights someone else other than Holm and loses? Once again there goes the big money rematch that Dana "The Manipulator" White lusts for
Keep in mind it's not about Rousey anymore. Dana White couldn't care less about Rhonda Rousey and her career. He has another womans cash cow (for now) that must be protected her name is Holley Holm.
In fact, there are many other examples of this scenario playing out with other champions who have lost in the past. One example in 2012 Anderson Silva a long time Dana White cash cow lost to Chris Wideman. What did Dana White do? He made sure neither fighter had another fight until they met each other a second time.
Chris Wideman fought Anderson Silva in June of 2013, after defeating him he fought NO ONE until there was a rematch in December of that same year. Exactly six months after he beat him the first time. Was Silva hot to fight him the second time? Hell No! But it was not up to him as he is owned by Dana White and company (the UFC contracts are one sided nightmares.). Dana saw big money in the rematch so he made sure that neither fighter fought anyone until they met once again in the Octagon for the big money.
The same scenario will play out with Rousey and Holm. Neither fighter will fight anyone else until they meet once again to assure Dana "The Manipulator" White a huge pay day. And this will probably happen well before Rousey is ready. As Irish wisely mentioned Rhonda Rousey should have a couple of tune up fights to get her confidence back and brush up on her ring skills. But, that won't happen. What if she loses? Bye, bye big money rematch.
Dana White also knows that Rousey coming back and beating Holm is a longer shot than most think. So, he takes the immediate huge gate and laughs all the way to the bank. Flushing his former cash cow down the drain and hailing a new champion. He then begins to get the hype machine going on Holy Holm. Who is also capable of doing one other thing that White loves, keeping the fight on the feet for more glorious knock outs. After Holm defeats Rousey a second time there will be a list of cans that Holm will knock out in glorious fashion and voila the story begins anew, he has another cash cow!
That's why you won't see McGregor, a really good stand up fighter. go against anyone who can take him down and beat him on the ground. He is going to milk McGregor for everything that he's worth. There are hundreds of millions of dollars to be made riding the back of McGregor and Dana White is going to revel in riding the McGregor horse all the way to the bank as many times as he possibly can. But...when that eventual day comes when someone does beat McGregor, and keep in mind it is Dana White's job to forestall that eventuality for as long as possible he will make sure that neither fighter fight anyone else until there is a rematch first.
This man has the money making end of the mma fight game down to a science. People mean nothing careers mean nothing it is all about Dana and company cashing in on the backs of the fighters.
To you fanboys...you can love MMA, I love it to. But, know this the UFC is not good for the sport in any way shape or form (yes they once were for certain). And all of you should do all you can to help promote other organizations. Hopefully one day one of them will rise up and be powerful enough to hire a few stars away from the UFC, or build up their own fighters and then real MMA will return to us once again.
Hopefully this explains my position to your satisfaction.