Depends on the retail pricing, I could see it being used for home or small office server or firewall. The main selling point is how easy the software that is pre-installed will interface with the end user. Make things drop easy to do, I think you can sell some units.
Problem; why would a firewall need a video encoder? Or the ability to output a >720p display?
There are better chips for this. The i.MX515 is capable but it's the wrong target market. I already explained this..
There's also the issue of naively marketing servers. Sure, a server that is really easy to configure with preinstalled this and that, is a great idea, but how do you choose what is preinstalled? You can get to quite a hefty set of applications and servers and clients if you try and meet every demand the system is CAPABLE of doing, or even reasonably sure your customers WILL do. You will not see, however, all of them doing all of them at once.
The current market for these things is split between the various different things; you might get a router that has a hard disk it shares out with Samba, but it's not a server.. just file storage. You might get a media player with a hard disk but it is not a router. You might get a router that has a hard disk and think, it can be my web server too (see above, what do you install on it? Just the server? Or PHP and MySQL and Python and Perl and a hundred Perl modules and Ruby and all the Rails?) but then you realize you just bought a router home which exposes a potential security risk to your network (it's best not to run webservers on your network borders..)
Bundling it all in the same box makes each individual use more expensive, and therefore prices itself out of the reach of normal people who see cheaper prices on the shelf next to it, which fulfills their needs perfectly.