There are multiple threads on this topic already, so I’ll link to one of those rather than repeat myself here.
But the short answer is that Zwave itself likely has a future. It’s the only mesh protocol that is UL listed for security right now (although I do expect that to change eventually), so Z wave is used for the Ring security system (owned by Amazon) and is the favored add on for light switches for other security systems like ADT.
Maybe more importantly, the eighth generation of z wave has some really cool features, including range of over a mile, making it an excellent match to use cases like hotels, and shopping centers. Again, more details in the thread below.
It may not have a future with smartthings, however, Unless there is an eventual Z wave to matter bridge from some other company, because SmartThings has already dropped Z wave from the station hub and the TV built in hubs, and the company has specifically said that they see the future as matter and Zigbee.
Anyway, see the following thread from earlier this year, as it goes into detail on all of these issues: