Achtung, T-Mobile: if Project Dark is $50 unlimited, you're in trouble

Put yourself in T-Mobile USA's shoes for a moment: rumor has it that the guys who pay the bills aren't happy. History, happenstance, and the realities of electromagnetics have left you with an oddball 3G frequency that literally no other carrier in the world uses (at least, not for HSPA). Larger competitors don't take you as seriously as you'd like, and you don't have smaller ones -- they're all regionals who don't play in the same space you do. So what's your next move?