One of the reasons that I decided to bite the SID's bullet was reliability, the aircraft are about half life according to Cessna and the aircraft is the only game in town when it comes to the training mission. In Eurore there are a few STC's to put Rotax engines in the C150 and it is only a matter of time before the C152 gets an STC for the 115 HP Rotax.
I want to be in the position that I have an airframe that is worth putting the Rotax into as I would love to be rid of the Lycoming due to the declining quality of the parts avalable from Lycoming.