This isn't the only article to present this. The information originated from an internal EA meeting, if I recall correctly. EA Higher-ups have refused to go into detail about this proposal as it's simply that: a proposal.
If it becomes a reality, and I see no reason why it wouldn't, most educated people will see this type of pricing system as the blind greed based money grab it is. However, I believe that unfortunately enough people will pay the asking price and give EA yet another revenue stream besides striping features out of their games and selling them back to their players, and shipping only part of the game at retail and allowing the players to download the rest to destroy the second hand games market. Looking at EA's history, this feels about right.
Anyway, EA have already clarified that they aren't charging for demos. They might release prequel game content to those who want to buy it. It would be shorter than the full game, and cost less. It's purely optional.
Technically 'Prequel game content' could equate much to the same as the original Starcraft
Demo. This featured a short campaign which was a prequel of sorts to the main game while still being considered a Demo. Either way you dice it, EA is looking to charge for what has always been free.
True, it could be a 'Prequal game' and enhance or expand upon the retail product. However, what would be the point of this? Hype? Hardly, EA know that the vast majority of their games are utter garbage and long term sales are killed by word of mouth. This is why they release so many games a year and give Developers two year development deadlines to ensure profit margins. This 'prequel' content would cost as much as the content in the retail game to produce, so why sell it at discount price? EA don't give away anything for free.
Most likely, what EA are actually suggesting is charging for BETA access in different words, if they indeed intend to act upon their players feedback. As I've already said: either way you dice it, EA is looking to charge for what has always been free.