Hate to say it, but after playing most of D:OS and thinking it was very good but not great, I share alot of the OP's concerns. Really, what raised my antenna was in one of the recent interviews I saw, Sven mentioned there were some of their team members who hadn't even heard of the BG franchise. However I am confident that Larian will be successful because I do think there is genuine passion in the Divinity games and from what I could see in the interviews, a true reverence of and respect for the legacy of the BG series.
I am truly excited to see what they come up with.
It's funny that you say this because Baldur's Gate was only made real time with pause because BioWare was doing an RTS that got cancelled, and they didn't have enough time to convert their engine into a turn-based system. So no, Baldur's Gate was never made to be RTwP. It was a complete accident born out of necessity.
Ha! What a load of absolute nonsense!