No, your statement is wrong. The Big Four, at this moment, would not cede any further bargaining power to Apple if they are now to allow their DRM tracks to Apple. Fact is, The Big Four have already made their DRM tracks available to other venues such as Amazon.... so it's NOT like Apple iTunes will be some all-godly-powerful exclusive seller of their DRM tracks. Customers will have a choice to obtain DRM tracks from other sellers other than Apple.... be it Amazon, Walmart, or whomever.
Yes, but that is the point, by doing so the big 4 are forcing those people to shop everywhere BUT iTunes and therefore give themselves bargaining power by taking control from them. The music industry is as stupid as Hollywood!