the issue with providing both, is it requires the game behaving very differently for each potentially, which is a potentially huge amount of extra work being asked for.

I do agree that it's a nice goal, but with a D&D game, focusing on getting the rules right comes first for me (and seemingly a fair few others), if they can show they could get the rules right for both RTwP and Turn Based, I'd be down for it, but if they have to compromise the rules to fascilitate RTwP, Turn Based should be the only option.

But who knows how it'll pan out