High end competing for top 20 schools have the option of taking college classes online during senior year.
It’s the next tier down that I‘d worry about. The ones who need the credential of SAT, but can’t just shrug off the extra work of adding a JC class.
Would require a rethink in the admissions committee. When I was doing admissions work, 2 activities were usually at the bottom of the barrell: high schoolers taking college classes (it's figured that kids who are bright enough to get into a top 20 school should be able to do classwork at this point and showing you are better at taking even college tests doesn't help you distinguish yourself), and jobs (like working at McDonalds or CF). I always thought particularly the job thing was stupid because a job shows maturity and responsibility but in evaluation forms given to interviewers these were usually listed as examples as extracurriculars "without distinction". Maybe thing will change with the pandemic but I doubt it.