That's what they said about horses with buggy behinds, but only the Amish do it anymore. When the first machine came on the scene in the early 80s no one ever realized it would turn into what it is today. Nothing stays around forever..... except the tuxedo. That sucker hasn't changed in 150 years.
As long as there are monument companies, the need for plotter cutters will remain. Lasers are becoming the norm with black granite and composite materials, but until they can evolve enough to deeply incise a wide variety of natural stone products, sandblasting will continue remain the top contender.
The relatively low - cost entry, reliability and predictability of sandblasting will always remain attractive for startups and bootstrappers...especially since there is a market glut of equipment (conventional plotters) left behind as sign makers migrate toward digital printing gold rush.
Yes, there have been some jaw-dropping new industry breakthroughs in the past few decades, but lagging behind by three or four "technological generations" can still be very profitable.
The digital "sizzle and pop" is stunning, but it doesn't have
all of the "sensory-factors" like the older technologies. Thirty years from now, people will be running their fingers over truck doors and saying "Wow, that's genuine cut vinyl lettering....those dudes were truly craftsmen". Well...maybe not that extreme, but who would have ever predicted that vinyl records could make such a fierce comeback? Clicks, pops, white noise and always replacing needles...oh, the days.
BTW...I have an acquaintance who swings a pretty mean hammer as an artisan blacksmith. I don't believe his business has suffered any setbacks by the digital revolution
http://www.sandersoniron.com/old/
JB