That's the million dollar question.
TEK seems to be gaining in popularity, as the rise in price and POS difficulty (+0.003 for the last month) tends to confirm this.
Actually, I think we are in a secular bull market for all mature coins due to global economic turmoil, rising interest from Asia, and people growing weary of the quantity and quality of new alt coins.
Here are the current diffs of other popular POS coins:
CAP -0.00734, HBN - 0.008062, NVC - 1.74142375.
So if you ask me, I would guess no, the difficulty will not go down as long as price grows.
There is a point in time -- and I've not figured out when -- when compounding wins over waiting for low POS diff. I going to guess around 0.003 diff, but it would be neat if someone did the math.
Anyway, you should adjust your strategy accordingly. Good luck.