I think the main issue is that the Surface RT is a 32-bit machine, and everything Remix is doing is 64-bit. Now, if they DO decide to put out a 32-bit version, then it would be much more feasible to have it on the Surface RT. I know that Microsoft has stuff in place so you can't put another OS on ARM devices that they've got their hands on, but we also know that the Surface RT can be jailbroken (
http://www.makeuseof.com/tag/how-to-jailbreak-your-windows-rt-device-and-run-unapproved-desktop-software/), which would open the door to having Remix on those devices.
I think having Remix on the Surface RT would be the best use of that hardware. I got a used one from a friend and am just not happy with the options or "apps" that are available...
-m-