The motivated, high-achieving students are doing alright. They won't be left behind. The low-acieving unmotivated kids are falling farther behind, though. They constantly need somebody to ride their ass and make them learn and it's just not happening.
Some kids are suffering mentally but not in a higher percentage than the adult population, iMO.
People who think going back to face-to-face will just be like it was in pre-pandemic days are living in fantasyland. Maybe in a year, but not now. Hybrid will be tiny cohorts in masks sitting far apart doing what is basically online learning. No science labs, no collaborative projects, no teachers coming up to them to help them, heavy clampdown on kids socializing, way fewer hours of instruction per week, the whole works. Almost a third of the HS kids in my wife's district have chosen to just stay at home for the rest of the year, and that poll was taken back in Nov. before things got really bad,