That may be true, but only because they might be the only company releasing such games.
I love what they did with BG 1&2, but I agree with FunktionJCB. There's a big difference between creating games using an existing engine, characters, etc, and creating original titles.
I'd love to see more classic D&D, but I want a modern engine and an original story and characters.
Yea, true, it's a whole another kettle of fish to make a new game/expansion, compared to improving upon an existing one. So it will be interesting to see how the new expansion turns out. That said, while it would be nice to see a new game engine and story in the D&D universe, at this point I'm just happy to get a new game in the series, even if it is with older technology. But yea, a new infinity-style engine, combined with new games set in the D&D world? That would be awesome.