I disagree. The safest thing is to reduce crashes caused by blowouts, pull over, and call BMW assist and wait for a tow. If spares were cost effective, we'd all have that $399 BMW spare tire kit come stock instead of RFT's.
While I've driven on flat RFT's for longer than a few miles with no problems (and generally if it's blown and I'm driving on it, it's getting replaced anyway), I don't view their value solely in being able to drive to a gas station to plug/fix them. I also view it as RFT's help me maintain control of the vehicle during what could be a dangerous blowout.