If you are going to
require students/employees to use a tool like Zoom (and choosing it for lectures is definitely making it a requirement) then you are obligated to, at the very least, seek informed consent from students/staff as to what privacy they are giving up. And if someone doesn't consent (voluntarily), you have to seek alternatives and mitigations.
If you're a Comp Sci or Engineering prof you really have an obligation to try harder. You have the capability to explain mitigation techniques (virtual machines, sandboxing, using temporary email addresses, VPNs).
Longer term I think we will see a host of Zoom competitors, because really there is nothing special in the client. Hangouts in particular could easily eclipse it with some work.
Also, I think the grid of faces approach is just awful. Many people have been working on VR meeting systems which have significant advantages for multiperson communication (i.e. discussion vs broadcast). Lecture/theatre VTC (which provides an aggregated feedback signal to the presenter) is completely unmet by Zoom. So once we're past the hump the field will broaden, and at that point the privacy requirements have to be enforced rigourously.