It is more likely that people will become cyborgs and maybe even have artificial full body replacements that your brain is transplanted into, you will have to plug in and recharge frequently. If that sounds unlikely to you, there is a Russian research project underway to develop this technology. There have been articles about this for almost 3 years now, it's not BS. There is also a plan to do the first human head transplant in the near future, yes that may really be possible now, you may have seen it on the news in recent weeks. They could also remove your head and attach it to a console that will keep you alive, and that technology has already existed for a long time now. Of course your head or brain eventually die too, but you could live a very long time.
Here is a video from more than 75 years ago, it is 20 minutes long, part of it may be very disturbing for some people so don't watch it:
http://youtu.be/nWZqObVwK4A
Here is a very short video just over 3 minutes. You probably shouldn't watch it:
http://youtu.be/R2BxGOdYm8U
They later experimented on monkeys too, and don't think they didn't eventually move on to humans after the technology was more perfected. You can be sure there is a secret lab in Russia with some human heads attached to machines that have been alive for years now while they perfected the technology.
Alan