Only for the android phones... Why would consumers want to buy a BB10 phone that can't run anything they want when they can get the a device from the same manufacturer that can?
Also BB10 will still be in the exact same spot. The android runtime becomes older and older, there is no google services integration so all apps which require it (which more and more do) will not work out of the box on BB10. Also just in general if BB does not update the runtime, eventually most new android apps will not actually run on BB10, even if they do security updates for the next 3 years.