I personally love the topiary aspect of Tomorrow land. The fact that all the plants in Tomorrow land are edible is certainly a staple. Also the Theater where EO is should stay, though they need to update it.
Space mountain has plenty of Que space , plus with the added fast pass availability it has improved the lines.
If you focus only on the line for space mountain and try to get rid of family fun experiences such as the theater you will lose out on the family aspect of the park.
NOW, I do agree it needs looking at, and last when I was speaking to imagineers this will be a huge undertaking. Look at the people mover track. Walt would have never let it sit there for as long as it has, un-used. The problem with removing it though is they would have to shut down several high profile attractions for a length of time.
A person attraction I don't care for is the innoventions. If I wanted to play with computers Id stay at home , not go to Disneyland.
Also, I'm a huge fan of the amazing engineering feat of cars land, but is anyone else just as surprised that Autotopia didn't become a Cars themed ride, or removed .