Both the 9mm and .300 Blackout are popular subsonic/supersonic carbine cartridges that can tackle some of the same jobs.
Modern Engineering Marvels on MSN

Pocket .22s after dark: Easy carry, hard tradeoffs

A pocket-size .22 can solve the carry problem and create a confidence problem at the same time. That tension is what keeps ...
Modern Engineering Marvels on MSN

Glock 32 owners face a smaller parts pipeline now

Discontinuation does not make a pistol obsolete, but it does change the math for anyone who intends to keep using it hard.