[Security] The future of travel

I've placed this idea into the public domain before, and I'll do so again now.

"How long until airline travel will entail being stripped naked and sedated for the entire flight?"

My mother thinks the airlines would be nice enough to provide minimalist garments, like hospital gowns, prison jumpsuits, or those paper garments that some police departments give prostitutes. (quick aside - Japanese businessmen would often take off their pants and fly in their underwear during long international flights, at least according to someone who worked in the industry a while back)

Seriously, the potential for sexual abuse of sedated and/or naked passengers, medical complications from sedative, etc. don't make this joke suggestion at all likely, but we seem to be getting to the point where there will be no carry-on luggage at all, a near-strip search will be required of all passengers (or its terrahertz imaging equiv.), and waits to get on a plane are at least a third of the waking day.

Will bus and train travel follow up with similar rules? How long until we require passports to travel between states, much less out of the country?

How much will this end up costing us, in time, and money, and how much security would we actually gain? I for one am looking forward to hearing what Bruce Schneier has to say.

Any bets on the timetable for some of these security "enhancements"?