James Gasik
We don't talk about Pun-Pun
The game is based around the idea that most power sources grant supernatural abilities, and these abilities are most commonly presented as "spells'. At a base level, the Cleric and the Wizard's ability to cast spells is identical, even though not all the spells they cast are. What differentiates these two classes is their secondary abilities. Every Class in the game either casts spells, or has some way to get them through a subclass. Making Psionics different is a worthy goal, but the juice might not be worth the squeeze to innovate to that degree.
It seems like every time WotC does try to innovate, there is immediate backlash from a vocal subsection of the fanbase (sadly, one they seem to listen to). So in addition to them not wanting to make 5e complicated (except, you know, when they make it complicated), not wanting to invalidate the PHB until they can sell us a totally new one, and this sort of reaction, I rather doubt they will go to the effort.
And even if they did, judging by the way they design things, it would probably be a broken mess anyways.
It seems like every time WotC does try to innovate, there is immediate backlash from a vocal subsection of the fanbase (sadly, one they seem to listen to). So in addition to them not wanting to make 5e complicated (except, you know, when they make it complicated), not wanting to invalidate the PHB until they can sell us a totally new one, and this sort of reaction, I rather doubt they will go to the effort.
And even if they did, judging by the way they design things, it would probably be a broken mess anyways.