I'm not sure what point you are making there, or why this topic was raised apparently in conjunction with bmi, but ALL Frequent Flyer Programmes have similar clauses (or, if not written explicitly in the T&Cs, it's what would happen anyway).

People that had miles in Malév and Spanair's programmes lost everything with those airlines failed. (bmi did not fail - it was sold to BA, who chose to wind down Diamond Club and move most members over to their own FFP).

And most airlines don't make it just contingent on the failure of the airline - most give themselves the right to terminate the programme at any time (though they will usually give at least a small period of notice).