Anything over 50% at the end will be a massive achievement for Sony, and will ensure PS4 support for almost all big games, making it difficult for 3rd parties to justify X1 exclusivity (like Titanfall, something you would doubt would have happened if EA felt PS4 would take such big lead). 70% however, as of now, seems implausible.
While its rather clear PS4 will "win" the sales, X1 shouldn't be counted out so soon. As MS has demonstrated by their "180s", they are very receptive to market changes and reactions, which is a good thing and will help X1 sales.







