This is already happening with the bandwidth caps. If you don't buy from them, they will make it painful to stream elsewhere. Continously run over your cap and get disconnected. Take my household for example:
4 kids with internet
3 ipods (i tunes)
4 xbox 360s
Wife works from Home 50 hrs week on VPN
I do significant amount of support "on call" from home
add to this, general internet use, online backups, email, ESPN360, etc..
then toss in HD Netflix..?
It adds up...