Personally, I don't like English-accented voices. In fact my German factions are all in German. But, many people are requesting accented voices for the Soviets so they know when they're under attack, or when a point's being seized, sniper, etc. So my thinking is, instead of replacing the literally thousands of voice files why not just replace 20-50 of the most important? Of course this would still require voice acting, but it's better than nothing. Then you can just make the voice files a separate optional download.