@cpratt - as a word of encouragement in the middle of the storm, I'll share a story from my career:
I retired from a Fortune 50 manufacturer a few years ago, and during my tenure, twice managed a complete redesign of our primary brand's product trade dress (color scheme, logo, decals, etc.). We're talking a multi-million dollar project here... and we had good reasons for making the change both times, mostly related to creeping brand dilution from copycats.
Both times, the initial reaction was almost universally, "we
hate it!" But the same people that said they hated it after the first redesign, were the same ones saying they "loved it, and why'd you change a good thing?" compared to the second redesign!
The biggest challenge was that the iPhone was invented in-between the two redesigns, and people were able to vent to a much larger audience the second time around. I had to keep telling our social media team not to worry, it would settle down after a while, and folks would eventually "love" the new design, just like they did with the previous one they at first hated.
Sure, there will be some that bail out of YT, but think it likely that most who stalk off in a huff this week won't stay away forever.
Y'all did a great job with the transition - it's been a refreshing change and has added a huge amount of functionality to using the site and interacting with others. Good on 'ya!