I don't have a problem with PM moving to a subscription model, I get Camera Bits need the revenue to continue development. I would like more details about pricing and whether current licence holders will receive a discount though.
That said, May 2024 is far too soon to sunset support for PM6, especially with the black Friday promotion. I wouldn't be dropping a significant sum of money on a product that won't be receiving any updates. Post-May 2024, at the very least, PM6 should receive bug fixes, security updates and OS support for at least 12-18 months.