I recon as material get strong and lighter and this will help to move things on but there will be a limit, there would need to be radical advancement like spring loads or gas powered rams; who knows!. Thats the problem with the future, the most stupid things could be mad to work. Also if things like like hover bikes get invented thats would be super cool and I so get one . Or they could end up looking like this LOL >>>> http://indianspencer.blogspot.com/2007/05/...-of-future.html Good topic!