Companies that don't want market transparency will simply restructure compensation packages -- "bonuses" doled on on a 24 pay period amortized schedule are an option even when equity isn't.
In tech, salary being mostly useless as a measure of total comp is already the status quo... if someone tells you that their salary is $160,000 then could be making $160,000 or they could be making >$1M. Expect to see similar behavior but even at the $60K/yr jobs.