What I just read on this subject, from CNET, is that the next OS after High Sierra will still run 32-bit apps, but Apple will call any to your attention. App developers are of course urged to make the change to 64-bit. Some of Apple’s own apps need upgrading.
OS 10.13.4 still runs it but Apple has announced that 10.14 will not.
As of today, what current Apple app has not been upgraded to 64 bit?
Sound Radix has announced that they intend to keep 32Lives working if they can. Perhaps there will be other 32 bit wrappers but I’m not counting on that.
I’m making plans to upgrade Office, dammit. I want 2008 to work forever. I have 2011 (which still installs in 10.13) but never liked the interface. Other than that, DSP-Quattro has been promising 64 bit for years — perhaps this will get Stefano off the stick.