IWhen they get color screens to where the battery lasts a couple weeks of use I'd say it would be worth it.
I think a Perdix AI with a SAFT battery is already there. And then some, I think. Of course, it depends on how much actual diving you're talking about when you say "a couple of weeks". My Petrel 2 lasted me a few months on an alkaline battery with regular weekend trips to the quarry.