I think the article oversimplifies a lot. Resource efficiency is just a tiny part of why RSS isn't more popular, and definitely not the main cause. It's actually a complex issue; for instance, RSS deprieves services from a way to effectively profile users.

Besides, the solution is not clarified enough. I read the linked website but there isn't a lot of details. Is it a sort of cloud service that receives push notifications for the user? The only thing I see is that it requires registration, and that can't be a good signal.

By the way, most RSS clients don't update that often. Mine does it every six hours.