Seems like a bit of a presumptuous proposition. If it were impossible, the web just might be a bit more shit, and the video monopoly would roll on regardless. Most might just come to take for granted videos of personal significance (I downloaded one of my grandpa in WW2 footage, for example, and there was no other version available except the YouTube one) are dependent on YouTube continuing to host them.
Some would, of course, use alternative platforms that offer proper download links, but it's hard to think that would be most, easy to think that would be well under 5% of those uploading videos that should in ways be a kind of permanent archive, or that this loss would really amount to anything to Google, commercially. Maybe not something to poke the bear on?