First of all, dana, excellent write-up. I am so excited to make use of my tokens with future dApps. The initial launch of the app store has me super excited for the potential power an individual will be able to harness. I made a similar article and compared iExec with its competitors and linked some of my favorite resources. If you guys are interested it's a great compilation!
https://steemit.com/cryptocurrency/@apie/iexe-the-golem-slayer
But that's actually a super interesting point. Need to think more about that one. True quantum needs insane cooling and thus will only be available in the cloud short to medium term. So my guess is very few will be available and heavily queued for truly intensive mathematical computation. However. the computing need for scaled applications will be more immediate. Longer term outlook maybe they find solutions to the cooling problem.