I fully agree with the fact that we should use free and open file format
SVG look's great and promising. I'm volunter to batch produce the svg file for all the vector library if you ask me

but keep in mind that eps is a "de facto" standard and used by a lot of graphical programs.
and furthermore even if postcript / encapsulated postcript / pdf are proprietary language / file format file
descriptions for both of them are freely and publicly available from adobe
eg: url]http://partners.adobe.com/asn/developer/pdfs/tn/5002.EPSF_Spec.pdf
this is acceptable for me (even if I'm a free software zelote).
and last but not least as you pointed, most of us are using the vector library files "as is" but don't tweak them.
The main concern is to be abble to use those files in order to produce nice side art, marques etc.
know how can you do this if you can't import the file in your favorite image editing program ?
without loosing quality I don't know much about programs importing SVG files
that's why instead of dropping ai AND eps file FOR svg i suggest to add svg files to the cart and let
the users to choose wich format he wants to use.