That's true in theory, but I don't think there are a lot of people ignoring the tech sector because median pay for a competent engineer is only ~$100k.
Sure, you can find examples of people who went into other areas, but given the very low barriers to entry (put some good stuff on Github repeatably, no industry requirement for an advanced or even undergraduate degree if you have talent, no unions or guilds, no competency certifications required to practice software engineering), I don't think there's such a big pent-up supply.