I was wondering how long the Season Pass for the game might be available for because I'm trying to justify spending the money on it now or waiting till later to just get the DLC's when I'm on a weird budget, does anyone know perhaps?

Seasons passes are almost always available through out the life span of a game (I'm trying to think of an exception but cannot). That said, eventually they'll release a GOTY edition that's cheaper than buying the game and season pass separately.

I decided to get the season pass earlier this evening. It's probably about $10 cheaper than getting DLC individually.