Seriously, Trump has done absolutely nothing for this, yet somehow you want to attribute it to him? Nah, we'll see how things are this time next year or so.
We likely are seeing a short term surge because of anticipation over what will happen. The problem for Trump is that this is likely an overoptimistic surge which means that growth could stall in a few months which will then lead to discouragement that feeds off itself to start a recession in Spring 2018 which politically is the worst time for a recession to start for the party in power. It's late enough that trying to blame it on the previous administration will have minimal resonance with the votes and early enough that those voters will feel the pain. Unless it's a short two quarter recession, such a recession will hurt the GOP in the midterms. Probably not enough for the Dems to retake the House unless it's a really vicious recession, but likely enough to set the stage for the Dems to retake the Senate in 2020 along with the White House and a couple of State Houses.
Still way too soon to say that the scenario above is what will definitely happen, but it is looking quite plausible this far out.
