I could foresee the "no-catcher shift" developing sometime in the not too distant future. It will probably start in Tampa - that's where these things always start. It goes like this: With no one on base, you move the catcher to become a fifth infielder (or 4th outfielder if Stanton or JD are up to bat). You essentially don't need the catcher if no one's on base. Yes, the pitch will go straight through to the umpire but - think about it - by then we won't have home plate umpires. The first baseman and third baseman will take turns retrieving the pitches. Once a runner gets on base, the catcher would return to his traditional position behind the plate.
Like I said, look for Tampa to develop this once the home plate umps are not required to be behind the plate calling balls and strikes. Tampa presses the envelope.