I would really like to see more character interaction in the studios. It's all well and good having Minnie and Woody in Toon Studios for meet and greets, and Spidey round the back, but that's it. I know not everyone is a huge fan of characters and prefers the rides, but even that is lacking a bit in the studios. RnRC is shut for refurb, parachutes only operate in optimum weather, RC and slinky are great but very divisive (if you're a lone parent of children of say 10 and 5....and the 10 yr old wants desperately to go on RC with you, what do you do with your 5 year old?). There needs to be more to 'fit the gap' between these 2 rides. ToT is great, but again, despite the low height requirement, not incredibly inclusive.
Crush has more often than not got a crazy wait time, and Ratatouille is amazing but breaks down so often its a coin toss as to whether you actually get onto the ride after queuing!
If they made some of the restaurants into character dining that would at least increase footfall into the studios. I would LOVE an avengers themed experience, or Monsters Inc.
Something definitely needs doing and I agree with the idea that expansion is the best way. It is just too small, even when everything is in operation and working correctly, it doesn't have the pulling power of the main park, for me and my family, anyway.