[hnarn]

From the article:

> the high court ruled that, under European Union law, Steam customers have a right to be able to resell ‘dematerialised’ goods, i.e., digital games on Steam.

IANAL but while this is a French high court, they have clearly interpreted EU (not domestic) law, so I think it's safe to say that if Valve loses the appeal, or decides to change it regardless ahead of time, they likely won't take the unnecessary risk of not rolling it out across the EU.