DPi is 'great' because it's cheap and easy. You take a p2 chassis that's readily available, put some makeup (stickers, nose job and/or blade wing) on it, throw your engine in the back that comes from another race car and viola! Look at my Nissan, Acura, Cadillac, Mazda 'DPi', which is actually a mildly modified lmp2.
As for the new lmp1 rules, I think the performance window means the cars need to be doing 3:20's at Le Mans and make a such and such amount of downforce/drag. I don't see them doing the bop route IMSA has taken when they have a perfectly fine fuel flow system in place.
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