The old lasers were brighter, the technology has also changed over the years too, now with that being said, I was in the world last fall and saw the show 4 times, the clearer and cleaner the night air the less the lasers were visible, on top of that I personally believe there is much more light pollution in the area that also lessens the effect of the lasers, lasers do wear out over time as well, depending on their source ie chemical, gas or solid state they do get dimmer over time just like a light bulb or led does.
Full color lasers are also usually dimmer than their single color companions so you get a trade off.
Personally I would like to see the current show refreshed, reimagined, plussed , whatever you'd like to call it, plenty of new tech out there to take advantage of