The fact that it's been less than a day and we've already discarded that notice as anything but a psyop by some undercover Disney branch is honestly rather indicative of our trust in the brand by now. I totally think this is a deepfake, since it's all "JJ is amazing and a True Fan™ of Star Wars™" it focuses on the popular aspect of "Rian Jonson is a shithead", which is true, but JJ created Rey Sue, so honestly, at least some of the blame lies on his shoulders. Considering his record with Star Trek and Lost, I don't think he's some innocent, and I don't think he's a True Fan™ of anything except the almighty dollar.
I agree with Comicsgeist: the Star Wars sequels were never to end at 9. That's why VII's such a reboot, they'd have a totally blank slate to work with on building their nu-Wars, to construct a post-war after they did the war again. Disney's greedy and arrogant, but there was thought put into at least the opening moves here. They wanted to make their own, new Star Wars. The EU was tossed, and they got JJ up because he always makes a big first movie with tons of boxes of PLOT to open later. They thought they'd sucker in the veterans with blatant aping of the OT, and bring in the 'new woke crowd' with Rey Sue's total Suehood, and they'd add in a total 'shock' and placate Harrison Ford by axing Han. Then they were set to their next step: quietly discarding JJ and tossing some young, new director in to try and start making the opening of a quadrilogy at the least. Unfortunately for them Rian shit the bed and they went into damage control after their second spin-off (with its own sequel tease, you know they'd have made Solo 2 by now if it wasn't such a monster). So in desperation they grabbed JJ back and are hoping they'll be able to take the fans back with Palpatine and this deluge of memberberries, while still setting up enough stuff to perpetuate the franchise.
Had they succeeded, Disney could have gone two ways with their films: either made a Prequel trilogy to the Sequels, or gone further down their timeline. I think they would have done both and marched the setting until everyone was dead and dust, constantly spinning off new things. The MCU was probably never meant to end, but with Thanos and Iron Man gone there really isn't anywhere for it to go. Feige now was tossed into SW to try and recreate some of the money of the MCU, but by this point, the goodwill is gone and man behind the curtain's been revealed.
The TL;DR of this is that JJ's return is a desperation tactic, Feige's involvement is another, and they're doing their damned best to try and at least keep the Fandom Menace at bay for three months or so.