Well, to my knowledge the Sprite Font limits you nowhere, since you can assign any graphic representation to any char (so you can do chinese, klingon lettering <img src="smileys/smiley16.gif" border="0" align="middle" /> )
I for my part am not really focusing on multilanguage support (making loca is a pain in the ass anyway and a waterproof localization in a language I don't really speak is nearly impossible)
You wouldn't have to trash the Webfont support, I am just suggesting a Plugin like the existing SpriteFont (wouldn't even need any more features) , just offically supported.
The things I want to do (retro pixel font with a shading, mutlicolor outlining) are not possible with the currently built in solution.
rock on,
Michael