Because they'd have to go back and install an SL5 for every international customer. That makes even less sense than putting them on reverse band. Plus they'd have to launch a new satellite to 119 when the current one runs out of fuel, which may be as early as 2021. That's obviously not happening, so 119 is almost certainly going away along with 110, and there will no longer be any use for SL5 LNBs.
Still easier than installing second dishes