SIPC has never covered "broker accounts", that were commodity brokerages.
Point of fact, when all of the major wire houses had large and thriving futures departments, SIPC would not cover them. It would cover all of their security accounts.
Remember the key to SIPC is "SECURITIES".
That does not mean that things cannot change, but (in the past AND the way that the insurance is actually worded), it covers securities.
That is why segregated funds were always sacrosanct. That is, until a highly connected democrat gets involved.
Look at how they've treated this country, why should they treat your segregated funds any differently.