There's likely going to be a separation between the top earners and the average.
IE. If a top tier dev make $1m today, they'll make $5m in the future. If the average makes $100k today, they'll maybe make $60k.
AI likely enables the best of the best to be much more productive while your average dev will see more productivity but less overall.
I think this is assuming that the labor market knows how to identify the dirct value of devs. This already seems to be a problem across the board regardless of job role.