This makes me so, so sad and angry at the same time.
Why do Disney feel the need to butcher a ride which has beautiful theming and still attracts significant queues all year round? In my eyes it will be totally unforgivable if they go through with turning it into Guardians of the Galaxy. Yes, I get that in any park attractions need to be updated, and yes, I get that the Marvel brand is huge and Disney want to maximise on this, however this should not be at the expense of something like Tower of Terror.
They would be much better looking at sorting out the Studios park in general. Tower of Terror is probably the best themed part of the park, as well as the area in which Ratatouille sits. Toy Story Playground is probably ok too, The rest of the park needs a lot of work doing to it to help bring it up to date. If they wanted to update an attraction, or add a new one they'd have been much better doing something on the site of Armageddon as that is very out of date and a poor attraction. If they insisted on using Marvel then I'm sure there's plenty of IP options they could go for on the Armageddon site.