Don't give up on Skyfire just yet, remember the company has ambitious plans to support a wide variety of devices in the future not just us Windows Mobile users so I'm sure issues like server capacity were taken into consideration from the very beginning.
The next version of Skyfire should be released in a few weeks according to a news snub from "
JK on the Run Blog", where the team hopes to launch support for VGA displays. There's a possibility's that this new release will coincide with additional beta invites being released.