Well, granted this is anecdotal, but I just did (almost exactly) that a few months ago. Chicago to Philadelphia and back via Amtrak, and it was all because of the TSA. 36-hour round trip when I've made the same journey by plane in the past and had it take only about 1:45. $300 train fare (after route 42 business-class upgrade and tax) when, due to family members working for Southwest Airlines, I could've flown free.
I'm far from the only one, too. Amtrak's ridership is at a record high and there are a lot of people saying it's all because airports are the worst places in the country now, due 100% to TSA.
And you know what? I'd do it all again. Traveling by train, aside from respecting my rights and dignity, was just plain nicer and more fun than flying. Better legroom, the most polite and friendly staff I've ever interacted with, amenities worth taking advantage of, and the ability to actually look at scenery and pick out interesting detail instead of saying "oh, look, another nondescript dot 35.000 feet away."
So don't write off rail just yet. Air travel sucks enough to push people toward it and make it economically viable. Hell, if they sold it solely on the premise of "speed-competitive with flying, but no TSA" they'd pick up customers in droves. The one bad thing about abolishing TSA is that it would hurt rail travel as people once again became willing to fly.