I honestly hope a dev comments here on the possiblities of it happening, I really would like to see spears and polearms for two handers. Even if they dont add a skill tree for it.
I've already suggested that before elsweyr too. That one was met with next to no responses, but I completely agree. In fact, we should get BOTH a magicka weapon and polearms at the same time.
Speaking of throwing, I think spears should be a melee weapon but you get a bundle of them on your back. Like the Order of the Hour troops carrying the throwable javelins behind them.
Adding spears would be a great way to balance Argonian racials; since in Morrowind (the last ES game with spears) Argonians had racial skills which boosted spears.