I predict youtube will escalate this way:
- Pump up aggressive anti ad block measures.
- It will fail, so they will enforce DRM so that they have control.
- It will not be enough, so they will ask to only serve DRM to "trusted browsers".
- And it will not suffice, so the trusted browser will have to run on a trusted OS checked by hardware.
That will work since almost nobody will take the risk to jailbreak their expensive device.
And we will all have lost.