I'd rather they keep the one price for everything plan. Once you start having tiered prices for different levels of service you are well on your way to the current cable TV situation we have now.
For watching the trailers I prefer Apple's site: http://trailers.apple.com/trailers/
But I can't argue very strongly against your point as it was a complaint of mine before I dumped cable.
Although if cable would give me access to all their content (tv, movies, sports, premium channels) for one affordable flat fee I would go for it.