I don't like zoom sessions personally, but I can imagine they would be a good option for a lot of people who have transportation or health issues, or people who don't have much time to spare, or people who live in rural areas where there aren't lots of therapists, etc... So if a therapist likes telehealth and can find enough clients who want to meet online, I don't think there's any reason they should have to go back to seeing patients in person.

Mandated, I don't know exactly what that would mean, who would mandate that or why. Maybe insurance companies could decide they won't pay for telehealth, but I find it hard to imagine they would.