I don't know the precise daily ratio of guests who want to ride Rise and its actual capacity - if I missed it in this thread, I apologize. But even if extended hours can't accommodate ALL guests who want to ride Rise, they would accommodate significantly MORE.
As I suspect you are aware, MK used to be regularly opened until 1 or even later, and maintenance and upkeep was superior to its present state. We know its doable, even if it might make things slightly less convenient for Operations - Disney might even have to consider paying them a bit more! There also seems to be the odd idea in this thread that the parks should be run for the comfort and enjoyment of Operations rather then for that of the guests.
You and others are also making a very big mistake in assuming every guest in line has the same level of desire to ride Rise, which just isn't the case. Yes, if Rise is the only significant E-ticket added to the park in well over a decade and one of very few overall attractions in the park to begin with, everyone who pays the exorbitant ticket price will want to ride. If there are a lot of attractions and shows - especially a lot of NEW attractions or shows - that changes. Some guests will be laser-focused on Rise. But a lot will just want to do something fun or something new (or eat at a themed restaurant or see a show that hasn't literally existed longer then a reunified Germany). I actually suspect that category is much larger then the Rise must-dos. Guests who spend a day in MK and ride Splash and Pirates and Thunder and Mansion will feel a lot less compelled to wait in a big long line for Space. The calculus would change if Rise weren't the only game in town.
And if you extend ride hours dramatically and add a bunch of new rides and shows and other experiences and Rise STILL can't accommodate all the guests who want to ride... you may have made some bad design choices when you built Rise.