You could certainly be correct - this is all a bunch of speculation. But I can still remember (vividly) looking at $300 green lasers and thinking "oh my god, who would ever spend that much on a laser (haha), will that ever be something I can afford?"
And I'm sure that back then (it's really not THAT long ago) the concept of 532nm DPSS seemed pretty tough, especially to make portable. But progress is progress.
Maybe a more interesting question is what do you think will happen first? A yellow DPSS for under $50, or an alternate source of yellow, made into a portable?
Well... here's the thing. With green, you can prettymuch pump in 808nm and watch your KTP "shit out a stream of photons," as our friend goninan_bl00d says. Because the process is relatively simple, Chinese manufacturers can spew them out like no other.
With our two flavors of DPSS yellow, the conditions for the production of the desired wavelength are much more stringent. The systems require
real engineers to produce.
If the incident beams aren't perfectly phase matched, you get green (or red, maybe). If the crystal is misaligned, the pump wavelength gets all over the carpet.
Even CNI systems thoroughly vetted by Laserglow have been known to sometimes emit green.
Random ChinalaserCo, LTD. isn't going to be able to build these until they've reached the level of CNI. Since this requires a degree in photonics, that is
not going to happen.
A yellow diode will happen first, or small-scale OPSL will get cheap.
One thing to consider, if an amazing use and sudden reason to need 589nm everyday arises, the pointers would be mass produced in China, and would drop in price just like the greenies did.
Supply and demand has always driven product prices even more than technological complications have.
589nm lasers exist for the purpose of sodium guide stars for use with adaptive optics in astronomy. There's definitely demand and an application, but I don't see it going into mass production. That being said, I'm not sure why CNI makes 589nm systems - they're certainly not what's getting used in telescopes.
The places we get our cheap equipment from are from mass-produced sources.
Having cheap data reading/writing wavelengths makes sense - but we've long passed the data density where yellow would make sense. That's out.
Display is our next best source. But... why use yellow when a larger range of colors can be made with R/G? Again... that's out.
I think our best source moving forward is going to be science still, but in the form of surplus equipment. We get our "cheap" argons and exotic HeNe's this way. Cross your fingers that people will start throwing away equipment containing 589nm lasers in the next few years.
-Trevor