I have plenty of 9MM - I think if I stopped buying 9MM all together I would have enough to last me until I am 80 - so a 9MM ammo crunch is not really an issue for me - but have zero 38 special rounds.This. I don't see a point in 9mm revolvers. As soon as there is an ammo crunch, 9mm becomes unobtainium. A local chain store has .38 Special in stock and it is my belief that .38 Special is THE easiest round to reload.
Seems like a benefit to shoot the same ammo through multiple guns VS having additional calibers.
I have also been considering a Ruger model 5050 - it shoots .45 ACP and Colt 45 -
I have a lot of 45 ACP - and buying a box of Colt 45 once in a while would not be a big deal.