Give it a few more years, perhaps five (?) and a new generation of hybrid Jet A1/Bio-fuel/Diesel (whatever can be bought cheapest) compatible engines - i.e. multi-fuel capable, combined with a very powerful, but lightweight electrical motor and super-capacity battery packs will be available.
People are already getting about 5 kilowatts per kilogram I think, like Siemens, out of some new light electric motors with superconductors.
Prodrive - the motorsports gurus in the UK are developing just such an engine with 300HP from the reciprocating 'diesel' engine and a further 300HP from the electric engine where one can back-up the other in emergencies (so effectively a 'twin') and 600HP is available when you might want it, for take-off for example. It is the same size and form or weight as a typical six-pot Lycoming or Continental equivalent including the battery pack.
Safer than a single turbine solution, possibly cheaper and easier to retrofit and as technology improves, may have ever-greater power to weight ratio over time.
If you gave Elon Musk the task of refining that technology and the batteries, in due course you'll get the powerplants you might want with the power you need to drive any little pocket-rocket aircraft over the 300 knots cruise boundary at a relatively sensible price. One day, maybe not tomorrow.
The safety side though is a no-brainer, if reciprocating engine fails, you have an electric back-up to keep you going until you can find a safe landing spot - or vice-versa depending on how the hybrid is utilised. And in a 'single' centreline configuration, no handling issues.