They won't. I don't think it will hurt the sales all that much and it looks like they're well committed to their digital family share plan. I still think it's cool and don't mind the DRM stuff, but again, it doesn't really apply to me since neither losing internet or buying/selling used games are an issue to me. I don't see how they could without fundamentally changing how games are used between people. I doubt they will admit they were "totally wrong" and scrap the DRM, especially after their announced partnership with EA (which already sent fear into my bones back at THAT announcement).
I'm still probably going to buy one and I'm still probably going to like it. If I had $1500 to spare, I would probably buy both day one. Luckily on launch day, I'm getting my XBO and my roommate is getting the PS4. They'll both be hooked up to 50" in the living room, so it should be a pretty good experience regardless of which one is on.
*Estimating around $1500 for two consoles, a game or two each, and a PS+ account (already have Live, which renewed last month).
Will probably get Forza, CoD:G, Dead Rising 3, Watch Dogs, and maybe Quantum Break for XBO. Will wait for some better exclusives on PS4.... actually, will probably wait until price drop or bundle to pick them up. Going back and looking at the games list has solidified my choice further.