Honestly, I won't miss UoE. I made my peace the last time I rode it. It's time has passed. The symbolism of losing another original attraction (even though it has changed) is sad and makes me long for the other great lost attractions..
Losing things is part of life, sadly. I reminded of these words from Indiana Jones and the Kingdom of the Crystal Skull (probably the best part of the movie):
"We seem to have reached the age where life stops giving us things and starts taking them away."
It's a painful thing, but at least in this case we are losing something and getting something back in return.
There's nothing like experiencing something new for the first time. I'm excited for that first ride. Thankfully and amazingly, there are going to be lots of "first rides" in the next few years. That alone is exciting.