> My pet theory is that 1) people don't want these jobs
Ask pretty much anyone who has worked in manufacturing if they liked their job, and wanted to keep it, and you'll generally get a positive answer. People were (and are) proud of their jobs. I've previously worked in manufacturing; the vast majority of people there loved their job and the company. Many were highly-skilled professionals. I've been in quite a few factories over the years, and it's the same story in most places. People like to do real jobs making an actual contribution to the society they live in.
The assumption you're making here is kind of typical for views expressed here on HN by people who have precious little real-world experience with life outside software. Very little modern manufacturing is dirty and dangerous heavy industry where people work like slaves. The vast majority is light industry with great work conditions. The world doesn't run on software, it's merely a facilitator. It runs on manufacturing. Don't forget that manufacturing is the fundamental basis of all our first-world economies.
> for the US to forget about manufacturing and focus on intellectual endeavors
"Intellectual endeavours" are mostly pointless if you can't turn them into something real and physical. You can't base an entire economy from doing nothing in the real world.