It wouldn't happen overnight, but surely if ATC had a similar compensation reputation as, say, investment banking, we wouldn't have the pipeline problem that we do now. Surely banks don't have a problem finding young, quick thinking minds to put through their pressure factories. I don't think the ATC candidate pool is currently even close to the limit of people who could take the stress and do the work. Offer controllers starting salaries of $1M/yr and see how things start to change.
Your point in the other thread about marketing the job to teenagers is also good. I wouldn't be surprised if most of the people interested in ATC aren't already "aviation adjacent" to some degree (ex-military, family are pilots, and so on)