Why would you want Thunderbolt again? It is a badly broken (IE doesn't actually do what is promised like channel bonding and a few other things that are sort of fixed in VERY recent silicon), costs far too much, forces the use of painfully expensive active cables, and only passes PCIe or video. This last bit is problematic because if you want any functionality on the other end of the cable, you need to add full controllers there too, think expensive and wasteful of power. In essence you are hot-plugging controllers with the cable, and while it works in theory....
TB is a badly broken spec from day one, it was meant as a control point for Intel to force the use of it's silicon in phones.mobile by replacing USB with something only it could provide. Needless to say the market saw through this and didn't adopt it in droves, sans the few that drank from the Intel money hose. The second the hose was shut off, so was the design wins.
The main reason that USB3 had such a slow start was because Intel was desperate to kill it to promote TB. Since Intel had control over the USB3 cert process, things went might slow for technical minutia that would easily pass by previous spec certs. Coincidence? Nope.
TB is a bad idea on technical, cost, lock-in, and many many other reasons, not working correctly ever being a key one there. Delivered silicon is a joke, there is and always will be one supplier, and progress is glacial. USB3.1 on the other hand beats it like a drum in every regard other than single channel throughput.
Why do I want to pay for this in my next laptop again?