Hopefully it'll scale down gracefully when not doing graphics-intensive work. RDP is quite usable even with 100ms latency and only a few Mbps. OTOH I guess nothing's stopping you from renting a machine from Amazon now.

I'd just be worried if they use H.264 that there's not lossless compression on most UI elements. RDP falls back to lossy video-compression like behaviour under pressure, and it looks terrible and quite unusable. For Photoshop and graphics apps, sure. But for text and most UI elements, ouch.