Its really no different to the Adobe model. Your best bet is just to go with the monthly or yearly subscription just as you do with Adobe.
A lot of marketing and effort was spent over a long period to flag with users the need to put their old licenses on support when the change happened. And rental like Adobe was what many folks wanted.
From Avids point of view what have you put in their coffers in the last few years?
Pat Horridge
Broadcast & Post Consultant, Trainer, Avid Certified Instructor
Free online Tutorials at VET digital media academy online https://vimeo.com/channels/752951
pat@vet.co.uk