Only if by "boatload" you mean one of those little toy boats that floats in the bathtub. Last year, NBC, the lowest rated broadcast channel, reported $4.2 billion in ad revenue (which represents a substantial decrease from the year before). At the top end, CBS reported $6.3 billion in ad revenue. (Source: http://adage.com/article/mediaworks/2010-rebound-broadcast-t...) HBO clocked in at just over $1 billion (estimated, final numbers pending) in revenue for 2011. (http://www.hollywoodreporter.com/news/hbo-top-1-billion-inte...) In order for a la carte to generate the same amount of revenue for a single broadcast channel, at say, $2/month, NBC alone would need 175 million subscribers, while HBO would need nearly 42 million subscribers (or roughly 1/2 again its current subscriber base).
It's not an ego game, it's basic arithmetic. Internet streaming may be the future, but it won't be the present until it gets a lot more expensive.