I don't think there is a real answer. We are now paying the price of pandering to Naderism/Consumer Power/Lawyers. It hasn't been worthwhile for any manufacturer to develop a modern, efficient four seater IFR aircraft so we don't have any. The aircraft you have at the moment is probably the best you'll get. As for the future, there won't be one until the last greedy scumbag compo lawyer stops breathing.
PM