Do you want FTL travel without causality violations? If you do, we will have to find an "ether", or a universal frame of reference.
There are various means involving exotic (as in, never seen before) forms of matter and energy that would allow FTL-like travel, some of which are vaguly warp-drive like. The fact they require matter that we have no evidence exists, together with the causality violations of them, make it unlikely.
Personally, I'd believe a future involving very-long-lived 'humans' (effectively immortal) together with near light speed interstellar travel as reasonable. If you live 1 million years+, a 100 year trip that takes a subjective 1 year to you isn't all that long.
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Last edited by JHVH : 10-29-4004 BC at 09:00 PM. Reason: Time for a rest.
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