I'm two semesters into OT school. One of my classes this year spent over half the time either watching the professor perform hands-on tasks, or having students perform these tasks on each other. Things like transfers, manual muscle testing, using goniometers to measure joint range of motion. And doing these with someone watching you that can provide feedback so that you use "proper body mechanics".
I extremely doubt that a completely online MOT program for non-OTAs is possible. If it was, it would greatly shortchange the students. You can't wait until fieldwork to do these kind of hands-on tasks for the first time. The best you can hope for would to get in a program that squeezes in those hands-on tasks into a couple weekends a semester.
For an OTA to OT bridge program, I could potentially see a completely online program (except for fieldwork). However, then you'd potentially see redoing your bachelor's degree program over, or retaking material from the OTA program because the students would come from a variety of schools that cover slightly different material.