Maybe. For thrills, I personally find them boring and un-engaging. The classic EPCOT dark rides were much more thrilling to me than the current slate, save for The Land and SSE... They engaged my emotions, not just a cheap thrill. Additionally, I don't want to have to wait until after Illuminations to enjoy EPCOT as I used to. EPCOT isn't meant to be another MK. That is why I like it.
I get what you are saying - that you see things getting better, and a high-quality, well funded Frozen attraction replacing Maelstrom is a step forward. I know people who think Nemo was a good addition to The Living Seas. I know people who think Horizons was boring and love Mission:SPACE. I simply don't agree.
I don't want to lose Maelstrom, even if Frozen is a great IP. If they want to ADD Frozen somewhere, they should. I don't see why we have to lose Maelstrom in the process. I don't buy that a company with assets in excess of $81B can't afford to build a new ride without demolishing/"downgrading" an old one.