People do use MO drives all the time. Pwerhaps not in the desktop computer world but have a look at any ultrasound machine or other medical equipment. It is a "standard". All the manufacturers have demo machines with about 6-7 different drives in case a consultant prefers one.
the main standard is CDRW and MO for large datasets. Normally my imager files are 300Mb-600Mb and I normally use CDRW or DVD; however I was being demo'd a piece of software then other day and turned up with one tiff since the image was a flatfiel and only 800K. The salesman looked at me and laughed saying "oooooo a floopy, that is SO OLD hat" I replied I wasn't wasteing time burning a CD for a 800K file. I therfore could nopt assess the software properly. His loss, and considering the software was 13,000 pounds, you'd think they would cover all eventualities. THe morral is. MANY firms use MO for convenience.