I'll still keep prime. I really don't care about Prime Video, I watch like two shows on it, maybe three, so I could care less if they add commercials.
Long term I could see me dropping prime but not because of video, but because of the shitty delivery service in the last few years. I can live without free shipping on every little thing... or save my Amazon orders until I hit $35 to get free shipping.
The funny thing about Prime video is it really is the worst. Video quality, sound quality, streaming stability... all horrible by comparison to the others. I use all these services on my phone on the train and prime is bleah.