Time Dilation

I am attempting to mentally deal with time dilation in a scenario where all humans have access to the fastest speed at which it is possible to travel. It is possible for a human to travel very fast and land in someone else's future. However, if all humans gain access to such travelling speeds, we lose the ability to travel to other peoples' future if they travel at that speed; we will still have the ability to travel into their futures if they are not travelling at the fastest speed. What would it be like if other people were to travel against the spin of the universe at the speed at which the universe spins? Oh my mother of evil gremlins! I don't even know

We will have the ability, of course, to travel into the future of the earth, and we'll also have the ability to travel into other species' evolutionary future. I imagine that we may very well take advantage of that to see how other species evolve; we may actually take it upon ourselves to aid the technological advancement of the new lead species. We would be aliens to them, and depending on how far technologically advanced they were, they may refer to us as gods (Arthur Clarke's third law suggests that sufficiently advanced technology would be indistinguishable from magic (our much earlier evolutionary ancestors who had yet controlled fire, may have thought that a match was magic).

So much interesting!!! STAHP! Not really though, universe - keep being interesting