I would think even Hillary Clinton could read handwriting on a wall at that point. If she loses Texas, she will quit. Within a few hours either way, Edwards will endorse Obama (yes, possibly before Clinton crumbles) and some superdelegates will jump ship.
Your scenario is plausible. Even more so if Edwards gives his delegates to Obama while Hillary is contemplating quitting.
Don't count on it. NEVER underestimate the KKKlintoons.........