Yeah the new changes seem pretty pointless. YouTube themselves point out that the creators with less than 1000 subs and 4000 hours watch time per year often make less than $100 a year but for some that amount still helps a lot and it also is something positive to see (like you said - it is encouraging), but also some make more under those thresholds but either way the attitude is just basically like "They make less than $100 a year - it's not like it's affecting channels that matter". 4000 hours watch time per year is demanding a lot too, especially for really time demanding types of content that take a long time to make. It's not really the little guys that are causing the most trouble anyway.
I understand leaving YouTube because you are disgusted with them. Their hypocrisy is one of a few reasons I'm not a rising star in the Creator Community anymore. Partially it was the pressure it was putting on my time too but I also didn't want to feel like I had to support all of their practices etc when I'm more likely to think critically about it and I don't think I can talk critically and objectively about it when I've got a badge as part of their community. I joined that community before the biggest waves of bullshit went down.
Going away from YouTube though I would be hesistant to only post on DTube though in case it goes down. I don't have a prediction on how well it would do, but the worst case scenario is always a possibility.