I have a feeling that the best response that blizz will get is to have the new races start out neutral, at lvl 55 or higher, with a questline similar to the DK line, and at the end u choose your faction, get some decent blues, and head to outland (or northrend if they raise the lvl cap)



Or the only other way I see it is a whole revamp of the old continents, making them phased zones, and lowbies see it as it is now, and once you complete a questline, you can no longer see the old way, but the new "fixed" world, with higher lvl content, and new dungeons/raids