I think when one has to take a look at psionics in the game, one needs to take a trip on the Wayback Machine, back to the state of SF&F literature back in the 70's. Back then, reprints of old authors was quite common as there was not as much new fantasy fiction being written back then as there is now. Many bookstores had huge shelves dedicated to Burroughs, Howard, Moorcock, and Lieber. Many, but not all of those guys were pulp writers. In the pulp days, the line between "Sword and Sorcery" and "Sword and Planet" were quite thin. Most people who were big Howard fans were also big Burroughs fans. Many D&D fans back in the day were both. Since many fans saw very little difference between half-naked guys with swords rescuing half-naked girls from evil sorcerers, and half-naked guys with swords rescuing half-naked girls from aliens, they felt that Sword and Planet stuff could fit in D&D and not feel out of place. Thus, enter psionics.
Since psionics in D&D owes its origins in the game to the Sword and Planet genre, I think a science fiction feel is not out of place. Thus psionics should have a feel that captures that flavor. Telepaths, pyrokinetics, ESPers, etc. would all fit in nicely.
Howndawg