Another reason he'll be in the white house for no more than 4 years. Too many promises he just can't keep.
This is not necessarily true. It looks to me like a lot of blue collar voters turned out for Trump or switched, but an absolute truckload of voters didn't bother to vote for either party. Trump is barely tracking above McCain and is still behind Romney. There are other things to consider - the count isn't final, and population has ticked up - but in general, Trump has, percentage-wise, turned out slightly fewer people than either McCain or Romney, while Clinton turned out a lot fewer people than Obama (especially compared to 2008). I caution people thinking this a is a mandate or wave election.
That said, while economics prevents a lot of what he promised to do, people may not actually care. Realistically, manufacturing won't come back for reasons of basic economics. If protectionist policies are implemented, that will make things worse, not better. However, he probably should be able to make strikes towards energy, and while infrastructure spending is a bad idea (Keynesian economics at its finest), blue collar voters might like it. If Trump has something to point to, he will likely retain that base.
I should note also that electoral politics is not necessarily results-based and never has been. People simply want to feel represented - to feel like "their guy" is in office. Whether that person is able to accomplish anything or not is not relevant - if they don't or can't, people tend to believe that they were prevented from doing so by the opposition party regardless of the truth of the matter.