this seems like a really bad idea. people can just join a company, get trained, then leave. hello corporate espionage.
And if you think the primary purpose of non-competes is to prevent or mitigate corporate espionage, I've got a bridge to sell you.
This proposal does not nullify NDAs (Non disclosure agreements), from the FTC press release:
"The proposed rule would generally not apply to other types of employment restrictions, like non-disclosure agreements."
There are also exceptions to partners and owners selling a business.