I would actually argue that the current releases are THE collections we will get for now. You consider that these are comprehensive paperback releases of chunks of issues and when it's done the whole series will be collected completely. I imagine if they had planned to do other releases, they would be putting these out in hardcover (ala Preacher or Y The Last Man) first.
Hellblazer is, IMO, one of the best comics DC has ever done, but it's always been dark and adult and starring a character that can be hard to like at times...and quite frankly it's done well in sales but never the volume of, say Preacher or Y The Last Man...so I think these comprehensive paperbacks are all we are ever going to see.
TBH, considering Constantine is bringing in elements like Doctor Fate, I imagine they will ultimately want to emphasize the New 52 version over the classical ultimately.