The switch from normal TV to HDTV is much like the switch from black and white to color.
Advertisers and networks see the potential in the new techology, and switch over accordingly. Not everyone wants to, or needs to right away. But someone like ESPN jumps on it right away because it realizes that broadcasting the NBA, NHL, MLB, and most importantly the NFL in HD is something no one else can afford, and will put ESPN another leg up.
Sports fans, see this, and when the prices on HD TV's come down to a price they are willing to pay, they switch.
Eventually, a majority of networks are in HD, and the rest fall in place accordingly.
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One day an Englishman, a Scotsman, and an Irishman walked into a pub together. They each bought a pint of Guinness. Just as they were about to enjoy their creamy beverage, three flies landed in each of their pints. The Englishman pushed his beer away in disgust. The Scotsman fished the fly out of his beer and continued drinking it, as if nothing had happened. The Irishman, too, picked the fly out of his drink but then held it out over the beer and yelled "SPIT IT OUT, SPIT IT OUT, YOU BASTARD!"
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