but I'm not so stuck in the mud that I would refuse to adapt to technology that WORKS BETTER
...says the guy who says he loves 1911s and revolvers, and uses leather holsters. (I'm just ribbing ya).
Sam, you mentioned RDS that have multiple year battery life, but you forgot to mention ones that use tritium. Those will last over a decade before you have to replace the tritium lamp, and there are no batteries to run out (or, from my understanding, circuitry, since it's all based on radiation, reflections, and possibly fiber optic amplification).
For those worried about the RDS failing, if it does, you can have BUIS (they just need to be suppressor sights instead of standard sights, some people even put a line on the RDS to use it as the rear sight). This will work better than if a laser fails, because it's only a minor change to the sight plane to switch from RDS to irons.
I'm waiting for the next generation of pistols to come out with more and more pre-milled slides factory standard, like the FNP/FNX 45 Tactical. I think that saving the shipping time and custom costs of having a slide milled will open the door for the RDS market. I don't think everyone will want them, even 50 years after this starts to happen, because it IS extra cost and a slight increase in pistol size (especially important on a pocket carry gun, because it might hook the pocket, but also a concern for other forms of carry), but I do believe that even in 10 years, we will see an increase in the number of people CCW with a RDS on their weapon.