Mind=blown

Unless traveling forward is the only time travel that ever gets invented.

This sounds deep but isn't. Anything that is ever possible is already possible. If it was possible to start a fire yesterday, under the same conditions it would be possible in 30 years. It was possible to build a jet engine in 100AD, no one knew how. The possibility of time travel or anything isn't conditional. This likely is a play on the idea that of time travel were possible someone would have already traveled to a period in our "past" or "present" but that too is a silly conclusion. Without fully understanding time and the universe we can't say that time travel follows an observational logic of continuity, or that multiple realities don't exist in which paradoxes aren't possible by nature (since events occur concurrently by possibility.) The topic could be discussed at length, but just by the phrasing of this, it's got nothing to do with time travel and simply a truism. If Photon torpedos and shrink rays are possible they are possible right now, that has no effect on our reality.

"I have a time machine at home. It only goes forward at regular speed. It's basically just a box with "time machine" written on it in Sharpie." -Demetri Martin