I think it’s a little premature to judge the space without knowing what it will look like (the plans so far are pretty vague), although I will say I don’t love the idea that this is supposed to be for 10 years only. If something is high quality there shouldn’t be any foreseeable time limit on it, to say it’s semi-temporary kinda indicates it might be “mid”, as the kids say.
That said… there are so many indoor playgrounds and children’s museums now, run by small business owners who don’t have millions to invest. Honestly it’s pretty amazing what they have for kids now in fairly average settings. If Joe Schmoe business owner can put together some really cool stuff in a local mall, I would hope Disney, undertaking the same project with a few million, can put together something really stellar, relatively speaking. If the area is done well, it could redirect tons of families and help with crowds. What parent with little kids doesn’t want an air conditioned space to let their children entertain themselves for a bit? Disney has a lot of experience building spaces for play on their cruise ships, maybe they bring some of that to this project and make something really cool (although so help me Disney, if this ends up being the never-used instrument wall you see at every local playground and one of those boards where you push buttons to make lights change color, I will judge you
so hard.

)