1) They should not have made this change retroactive to channels. If you already met the criteria you should be grandfathered into the new program. To terminate monetization entirely gives me no incentive to continue with YouTube.
2) For niche channels, like my own, it can be easy to have the views but difficult to have the subscribers. These two should not be tied together for purposes of monetization.
3) The ones that seem to be causing the biggest headaches on YouTube lately are the bigger creators.
4) Finally, their email to me says that they made this decision based on discussions with creators like me. I would be hardpressed to find a creator "like me" that suggested this. Instead, I suspect, they reached out to the creators with the biggest say and decided to squash the little guys for greater visibility.
I am curious if they will continue to monetize my videos while not sharing the revenue with me or if they will remove ads entirely from my videos.