This is counter-productive
France alone is not big enough a market to actually force Apple and other online music stores to force their hand and open up their copy-protection schemes to all music players and software programs. Most likely, Apple's iTMS will just close shop in France rather than deal with the hassle of making their store work with, say, Creative's Zen players.
This will also create a situation in which France encourages software engineers to strip DRM from music downloads to make them compatible with all MP3 players. They will get legal cover because the hackers can always claim they're interested only in making iTMS downloads work on a Walkman or Napster's music on an iPod, even if most people want DRM stripped to make it much easier to pirate. And as we all know, once a good hack is found, it'll spread all over the globe in an instant, potentially damaging download markets in other countries.
Subscription services can potentially be screwed over by this. And of course, all the major record labels can just say "we're not doing business with online music stores in France due to the unfriendly business environment" and just pull off all their offerings.
Perhaps if the entire EU joined France in pushing wider compatibility, this could work. (Ignoring all of Europe's much harder than ignoring France alone.) But France acting alone will have negative consequences.