You could put teleportation on that bottom squiggle as well. Sometimes you stop funding things because it isn't physically possible or we have better alternatives.
There's absolutely no reason to believe that fusion power is impossible. It being very, very difficult and very, very expensive to reach a practical system is the problem.
But you're right about better alternatives. Right now that alterative is a combination of solar, wind, hydro and storage, with perhaps a bit of more exotic systems (wave power? solar towers?) in the mix.
