We let all subscriptions lapse and not renewing.
I am a little surprised and do not encourage either way but I guess they got tired of paying for software and see no benefit in upgrading.
Careful with that - they may read that differently than you intend. For example, they could see it as the particular product not being popular any more and lean towards cancelling further investment. That means less work on it in the future, and so a new wave of people moving off that product because they don't see any benefits, and around and around it goes.
You might want to ask "them" what they are planning to do at the next OS upgrade. Chances are what you have now won't work properly, or at all. That could be a huge expense not just in renewing licensing but potentially migrating to a different system.
possibly, unless of course the 'message' was delivered very clearly to the reseller
as in
Sorry we will NOT be upgrading and or 'subscribing' any longer as the VALUE for our INVESTMENT is retrograde to the COST.
However be sure to have Autodesk contact us directly so that we may inform them of how disproportionate the cost of each new version is to
the relative 'benefits' of and lack of actual 'new' features each provides.
or something similar...then there should be little confusion that the customer is NOT seeing the 'value' due to the forced yearly upgrade cycle and lack of actual
product enhancements, and or number of new bugs or work-arounds that must be dealt with each year.