I can personally easily see Miqo'te + Hyur and Hyur + Elezen offspring happening, albeit with possible complications. Roegadyn, maaaaybe. But nothing with Lalafell, because... No.
I'd also like to assume that the offspring of cross-race couples would distinctly come out physically as one race or the other once fully grown (i.e. no Elezen-height Midlanders or Highlanders with cat ears/tails). Of course, I have absolutely zero idea of what SE has in store for hybrid people we may see in 3.0, so that is just hopeful thinking and speculation on my part.
I'd also like to assume that the offspring of cross-race couples would distinctly come out physically as one race or the other once fully grown (i.e. no Elezen-height Midlanders or Highlanders with cat ears/tails). Of course, I have absolutely zero idea of what SE has in store for hybrid people we may see in 3.0, so that is just hopeful thinking and speculation on my part.