Apple may well be looking at Thunderbolt and realizing that it just isn't "taking off" the way they had hoped. We sell almost no Thunderbolt accessories, but we sell a ton of USB-C stuff. It seems that, not only is USB-C fast enough for almost all users, but that it also supports enough underlying tech (HDMI, DisplayPort, Ethernet, VGA, DVI, USB—duh!, power, etc.) that there is very little need for TB3 at all.
The one thing that stands out, though, is that XDR display, which is Thunderbolt. Will that thing be a one trick pony?
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And then there is
this. If VMware runs, then I imagine Windows runs on it.