It's all relative. Relative to what? I think its healthier than it would have been had there been no manufacturing at all.
> Are those manufacturing jobs attractive?
Not all but some are for sure. I'm sure there are enough people working for Volkswagen, BMW or Bosch that earn well and prefer working for them than doing something else.
> Are the Germans and the Japanese richer?
Again, richer than what? I think they're richer than they would have been had they not been manufacturing anything. If you're asking whether they're richer than Americans, no they're not, but that's mostly due to historical reasons (U.S dollar is the world reserve currency).
But if you wanted to create blue collar jobs and if the government was going to step in and contort the economy with heavy handed measures, anyway, then just setup a public works program and build a bunch of housing, build and maintain energy and transport infrastructure, build climate mitigation projects. That would actually address a real demand and make a whole lot of sense.