Marvel has been doing better than DC for years in terms of sales so why would they need to do this? DC did this because they saw their sales lagging behind Marvel and felt this would work for them. I don't think it will because as someone else has said, once the only people buying are the readers themselves, it will settle back to where it was before with a small bump possible if they keep some of the new readers if the novelty doesn't wear off in a few months.
The new season looks really great. Let's hope they don't fall into the trap they did last year with all of the political episodes being in one long stretch instead of being interspersed with all the action episodes. Political episodes are fine but this is about a war and most of the episodes should be about the war.