Just to give another perspective--and this is certainly not directed against the many fans who love the idea of Tim Burton and Johnny Depp doing Dark Shadows--in my opinion, neither the director nor the star would be right for a new incarnation of the series.
I have no idea who to suggest. It would be great to bring in some fresh faces from the NYC theatre world as was done the first time around.
When I think of a new version of DS I would actually enjoy watching (and believe me, it's quite a stretch to think of it at all for me since I do NOT like remakes), I think more along the lines of Gosford Park than the Burton/Depp Sleepy Hollow.
G.