Honestly, this is the best possible outcome for Unraid users and Unraid as a business in my book.
Existing customers will keep the licenses in perpetuity, Unraid will get continual income from lew licenses if and when new users re-up.
The customers with perpetual licenses will be the ones who are the most vocal and evangelise about Unraid - I've had 2 friends get licenses since I set my server up, all because they liked how easy it was to manage. But it's understood that the company needs to make money, so a new model was needed.
Honestly, given the alternative scenarios, this was the best option for all parties, so thank you for not alienating the base that will help you grow.