What is your opinion regarding building high speed rail lines in America?

I just read there might be one built connecting Dallas and Houston. In the past a Miami, Orlando, Tampa line has been talked about. I’m sure there are many other places across the country that would be interested in the possibility.

What cities do you think should be connected if you think a high speed rail line would be a good idea. Keep in mind the expense and what you think the likelihood is people would use it.

It seems to me it only works really well connecting cities that have great public transportation in the city itself.