I'm definitely excited for a Mickey Mouse ride. But since it's replacing Great Movie Ride.. at the end of the day, after Toy Story Land and Star Wars, how many attractions at DHS are we up from before? Is anyone's day at DHS going to be longer vs a couple months ago?
Well, likely yes when you directly compare some of the replacements:
SWL - Replacing LMA/SoA. LMA had only been playing 2 shows per day for years, SoA added no value for 10 months out of the year. Very few people got enjoyment out of this side of the park. SWL is adding 2 high capacity E-tickets and an entire land that should also be an attraction to itself.
TSL - Replacing the former backlot/backlot tour area. The BLT, which has been closed for some time now, was losing popularity for years and had become a shell of itself. Personally, TSL isn't my number 1 choice I would've gone with, but more people will be likely to experience the area/rides.
Mickey - This is where it gets tricky. GMR is a people eater and usually fills up every ride, but that doesn't mean that it's always filling to it's full capacity of 2,400 per hour. On slower days, they run less vehicles, which in turn means less per hour. The highest GMR wait really ever gets is 45 mins. It's a 22 minute ride that is scoring poorly on G-Sat surveys. I think a Mickey ride that is shorter (even if still around the 7-9 minute time), will increase the number of riders in a day on the ride as it's a more appealing "modern" attraction which guests have actually come to expect more from visiting Universal.
It would be better if the Mickey ride was an actual ADDITION to the park, but as i've said, Disney obviously isn't going to update GMR, so why bother with the ride at this point? The Mickey ride could've been a nice beginning to an expanded Animation Courtyard though.
Both SWL and TSL expand the park's guest areas though, which is one of the biggest things. More places for people to walk around. Guests have never been allowed to walk around behind TSMM or on top of the LMA plot. It's mostly been for backstage or for the show.