This question contains spoilers… (view spoiler)[Get ready:
Ahem
If Hoid aka Wit aka in every Cosmere books in some form is a world hopper, it’s possible that he could universe hop to the Cyptoverse where Skyward takes place. So, if he could do that, in our possible future 4th era Space opera themed Mistborn - could the people in Mistborn at the time accidentally run into Skyward Flight? Because if the Allomancy (based on what I’ve read) is faster than light- (hide spoiler)]