I have found that audio modules used as modulation sources do generally still need fairly clean power or else visible high frequency noise can be introduced into the video system. But YMMV depending on what case/power you have and your tolerance for noise. I wouldn’t worry about it too much at first, but it may need sorting out down the line.
However, if you just pass audio into something like Sensory Translator or Diver, then noise is less an issue.
Given the wide range of third-party video modules now available (see top section here) — none of which use the DC power schema (except some of VH.S’s) — I don’t personally think going 100% DC power is a viable option in the long run. But it is maybe a good place to start.
And then you could introduce a Capsule power (or whatever new solution, if any, LZX releases) or Tiptop Studio Bus or other recommended power supply if you want to grow beyond Gen3 modules.