Well here's a figure-out from the man from Paine mansion: choice isn't enough anymore -- even real choice. It isn't enough for the Dems to drop "we're Pepsi, and that's better," or we're cola lite, or the un-cola, or whatever. (Cola, in this context, means the corporate global empire, of course.)
Any opposition party worth voting for has to be the anti-cola party -- the party out to de-colafy Washington, before it can be any part of a solution to the globe's present hell ride, and, for that matter, the average American jobbler's hell ride.
And of course the Democrats can't so morph -- not in a thousand reloopings. Maybe a fragment of the party, bursting left from a vicious internal explosion, can join other forces in a new party, an anti-cola party -- but for the Dems to become a solution themselves... nope. Never happen.