Uhhhh... that's a no from me.
Masters already has voice acting and it's pretty damn grating sometimes, which is why I don't play it. Whether a character's voice is suitable for them or not also depends heavily on the listener, and yet the aforementioned game has made some objectively terrible decisions - like giving Koga a fake "Japanese" accent in the English version. Now imagine this situation in a main series game. Yeah, I'm not buying the games lately, but if it can't be turned off like the majority of cutscenes in Sw/Sh and S/V, that could be a strong reason for me to quit the main series for good.
The only way I would allow voice acting in the main series is that a director and cast with backgrounds in both voice acting and real-life acting were hired. I get the feeling that the dialogue would sound a bit more realistic and less ear-splitting as a result, and therefore steer clear of some of the most common problems with voice acting in video games. Alas, that would be too costly, so I don't see it happening. I do agree with the complaints about singing scenes like Piers's or Ryme's being voiceless, but I would rather keep imagining what kind of voice they would have in my head than have to sit through terrible singing knowing it could be so much better.