-Everything gets more expensive, all consumers end up paying a higher price for all goods and services
-Anti-capitalistic, doesn't play to America's competitive advantages
-Will promote US companies to find new ways to increase automation to reduce labor costs
Nothing like doing something to make things look good in the short term to hurt the long term. Even if it succeeds for a bit in getting those jobs here it'll only go back to it's slow march back to no tariffs and global free trade once everyone gets tired of spending the wages those companies dont want to pay for on goods that are more expensive.
FTR the Donald's plan to fix (if the carrier deal is to be seen as a precedent, and i guess coupled with tariffs of some kind) this is honestly not that different from what Bernie was wanting, both realized how things like NAFTA and free trade sucked the manufacturing away from the US, they will just go about it different ways but the idea of trying to keep manufacturing jobs here is the same. The answer though is simply if you want to make the economy like the 1950s, 1960s and 70s, you will get just that, a smaller and less powerful economy GDP wise, it's not like the economy hasn't grown since then (spoiler alert, it has).
Serious question, what do you think of those fast food workers asking for $15/hour? Cause if your answer is "those people need to keep advancing themselves and it's not supposed to be a living wage" and you laugh at the memes of automatic tellers and be like "yup see told you!" then how is a bunch of line workers with very little skill any different? You will get more factories like Elon Musk's gigafactory, which is basically a tribute to the alter of automation. And oh hai, lookie there, those workers still dont get any work cause they refuse to change to the new economy.