The irony is that the experiences in Canada and US have shown that collectively single-engine turbopros are -- statistically speaking -- as safe or safer than twin turboprops.
See for example the annual reports on turboprop safety from Breiling & Associates. Every year single-engine turboprops have accident rates (and fatal accident rates) comparable to, or better than, turboprop twins.
In Europe, single-engine commercial IFR is already a reality in a number of countries (France, Spain, Sweden, Finland, Norway, etc.) operating under EASA exemptions.
What's being proposed is to harmonize the rules EU-wide. I believe the new rules will come into effect in 2016.