Thunderbolt 4 is on it's way with Intel Tigerlake which doubles the bandwidth but that still leaves limitations such as being limited to x8 PCI lanes which means you're leaving performance on the table if you use high eng GPUs and being locked in to Intel ecosystem so no Ryzen CPUs for you :(

And also cost $$$ which makes it a luxury solution only suitable for the users who absolutely want a thin portable notebook for on the go and a powerful GPU at home for AI/Gaming.