There are two business models for high-speed Internet access:
Model 1 --> Charge a small number of people a large amount of money, through individual daily purchase (which is the current business model for high-speed Internet at DVC resorts at WDW).
Model 2 --> Charge a large number of people a small amount of money, through bulk purchase (which is the business model that Marriott Vacation Club and many other timeshares use).
Model 1 essentially says, "Unless you need to do serious work, don't bother using the high-speed Internet."
Model 2 is the same business model that gives us cable TV and swimming pools. I don't think DVC guests would be very happy if there were a $10 per day charge to use the pool ("But I just want to take a quick 10-minute dip in the pool"). And the explanation that there are many DVC members who never use the pool wouldn't go over very well. A laptop user might just want to take 10 minutes to check e-mail or to glance at a WDW restaurant menu online.
It's unlikely that we'll see a cut from $10 (actually $9.95) per day to $5 per day. That would simply mean cutting revenue in half without doing much of anything to increase guest satisfaction or to add to the competitiveness of DVC or to increase the daily use. It would still be unattractive to use high-speed Internet unless one had an overriding business reason to do so.
We're much more likely to see Disney and DVC recognize that many guests now see high-speed Internet as an expected "pipe" in the room, just like water, cable TV, electricity, and a phone line -- and that number is increasing. It's just a question of when it will happen.