I am very well aware. If you didn't notice, I mentioned in an earlier post that USB-C and TB3 share the same bloody port. Old TB peripherals won't be useless, there will be TB2-TB3 adapters. eGPU solutions will never make it over USB-C because of the overhead of USB-C; besides 10 Gbps isn't sufficient bandwidth.Also, if you weren't aware, this is Thunderbolt 3:
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Which will fit inside a USB-C port, and render older TB peripherals useless. I don't see an External GPU solution from any manufacturer developed for 2-3 years until USB-C goes mainstream. By that time, time for a new Macbook Pro.
eGPU solutions will never become mainstream anyway, but it will exist as a plug-and-play solution once TB3 is completely out.