We have a rock-solid Incredible PBX platform with proven Asterisk 13 and FreePBX 13 components. There's no need to switch for the time being. Asterisk 16 and FreePBX 15 are experimental for us at the moment. It's a chance to kick the tires. Yes, there are things to be concerned about. Not only is PHP 5..6 coming to end of life, but there are key components in UCP that already are EOL. Now much of the talent pool has left. So we'll see what we see. Either Sangoma will pull things out, or we'll all start looking elsewhere. Either way, the world won't end. Having said all of that, I'm pretty amazed by the quality of both Asterisk 16 and FreePBX 15. Both were built on solid foundations so I don't think there's anything to be particularly concerned about insofar as the stability of the platform is concerned. When 2020 comes around, we can see what's changed and what hasn't. In the meantime, enjoy the ride or choose a commercial PBX like 3CX that is and undoubtedly will remain rock-solid.