Doubtful they'd want to do a lifetime pass (given how they've already had to navigate working with lifetime SkyClub memberships). Million miler complimentary status isn't even called lifetime either, just "annual." So perhaps if anything I suppose I could see some type of annual pass/subscription as an option. Maybe an annual domestic Y pass for unlimited flights in coach? Or maybe even an annual domestic F (excluding domestic D1) subscription/pass as an option.