I had similar thoughts. The future will be a mix out of post-apocalyptic and things which look now like scifi. However, we probably won't have widespread famines in the developed world that fast. Same for a global breakdown. I also don't believe in a complete breakdown of supply chains and end of shipping. Shipping and using a global economy is energy efficient per ton. It might end, when we have more automatization in the developed world or low wage refugees, or both.

There will be pockets of technological progress. The people working on self-driving at Tesla are only 150 engineers.

Tipping points being reached doesn't mean the bad things happen directly after that point, only that it is to late to reverse it, either with current knowledge and technology or in definitely.

Global mass migrations are also just lefty propaganda. You can't have lack of food and people wandering around for hundreds of miles. It's not possible. Same for the openess of target countries. Also, it probably wouldn't matter, only create more inequality and a bigger market for surveillance and weapons.