I think he'll slow down but I think he'll be a consistent 75-80pt threat. Hitch is using him well which I was worried about due to Hitch's history in CLB with Filatov. Apparently Tarasenko has a really good attitude which in a way neutralizes that 'Russian factor'. St. Louis has needed an explosive offensive factor for a while here and all indicators point to he's it.
As for trying to trade for him now, I'm not sure you're timing is great. Hype machine is in full torque, a definite buy high in which you will have to overpay. I'd wait until he hits a bit of a slump. (But here's hoping he doesn't, I drafted him myself...)
20tm UFA/RFA dynasty
Cats: G, A, SOG, STpts, +/-, hits/bs, GAA, Sv%, W+SO