If Disneyland reopens looking the best it ever has, it might help take some of the sting out of the closure. At the very least- they can make sure each railing is perfect and each building facade is beautifully painted. The plants should be in perfect condition. And they can repaint attraction interiors (a fresh coat of paint throughout the Fantasyland dark rides would be amazing). it's a small world was in horrible shape. Minor effects throughout many attractions weren't working.
In the case of Sparrow, I really doubt it's happening- but his integration into the ride was so minor they really could take out each figure and revert to the old dialogue without too much work (though I'm sure it'd somehow be a monumental task for WDI). I'd love for more of the original voice work to be present in the attraction, especially now that the most iconic dialogue from the ride 'We Wants the Redhead' is gone.
In another world I'd expect Splash Mountain to be getting some love right now, but I wouldn't be surprised if it doesn't receive any maintenance during the closure.
But I also think about how different the rest of the park is gonna be. No entertainment, masks, virtual queues, covid reminder signs everywhere- it's not gonna be going to Disneyland like we're used too- and since it's in Orange County California, not Orange County Florida- it's not gonna be Disneyland like we're used to for a while.