Dwindling crude oil reserves - What is the best way to cross the Atlantic in 2050?

I thought about a couple of options:

1) Fuel-efficient traditional aircrafts using biofuels
2) New generation of fast aircrafts using natural gas
3) New generation of fast aircrafts using hydrogen
4) New generation of slow aircrafts using solar panels and batteries
5) New generation of slow helium airships using solar panels and batteries
6) New generation of slow helium airships using the jet stream (flying east only)
7) Combination of hovercrafts and bullet trains

I actually like the last option. The shortest distance between Europe and North America is less than 2000 miles. So if you want to get from New York to London you could take a bullet train from New York to Charlottetown, Newfoundland and Labrador in Canada, take a hovercraft to Ullapool in Scotland (distance 3193 km or 1984 miles), then another bullet train from Ullapool to London.

Travel time? Bullet trains in the year 2050 could do 360 kph or 225 mph and hovercrafts could do 160 kph or 100 mph.

That’s about 5 hours from New York to Charlottetown plus 20 hours across the Atlantic plus 2 hours to get to London. Total: 27 hours. A lot faster than airships or the Queen Mary 2 and probably a lot cheaper than aircraft using alternative fuels. I’m not sure whether snow in winter might be a problem for bullet trains in Labrador. And what about icebergs and fast hovercrafts?

Are there any other good options?

How do you compare these options? How will we travel in the year 2050?

Paul Wylde, creative director for Teague’s Aviation Studio (a design consultant to Boeing) developed a concept called Flight 2.0, a radical approach to flying that involves government-subsidized airships, luxuriously slow travel, exorbitant fees for flying as fast as we do today, and less dependence on fossil fuel.

http://www.smartplanet.com/people/blog/pure-genius/flight-20-proposes-radical-change-in-air-travel/5347/

What do you think about his proposal?