I fear that it is only a matter of time before a couple of serious accidents happen in big and fast single turbines in IFR before this is bought to the attention of our friends the CAA and they will try take steps to ban all (not just commercial) IFR single engine flights.
That is impossible without making a mockery of ICAO. It will never happen.
IFR (airways) flight is nearly 99% in VMC and is the safest way to fly. The most dangerous flight is VFR, squeezed between terrain and cloudbase. Loads of people get killed doing that.