A player in our group purchased "storage" space at Ema's site, printing out power cards for the group in our 4E game. I was surprised at the time that a non-WotC site was able to (or more to the point willing to) do this from a copyright perspective. As such, I'm not surprised that a C&D was eventually sent although the timing seems interesting. Leave Ema alone initially as they try to grow 4E as a brand and product, but once they have their own Character Builder (with which Ema is now directly and illegally competing with), they close it down.
However, would WotC just want this directly competing site closed down or just the pay for storage part (which by the way guys had 4E stuff)? I have a feeling that Ema could have left just the character sheet stuff up and things might have been sweet. However, without the income stream, maybe Ema figured enough was enough, easier to close everything down and take a jab at WotC in the process. Maybe?
The aim of my speculation above is to demonstrate that we don't know the full story. Until then, over-reacting to it one way or the other might be rash. WotC have done a good job gaining good will after the Dragon and Dungeon debacle. I'd be surprised if they'd lowered the bar on this one.
Best Regards
Herremann the Wise