Turbines are fuel guzzlers It would make your sedan's fuel consumption put an HMMWV to shame
You got a source for that? Your standard Gasoline engine is 20-25% efficient. Gas turbines have are over 60% efficient. That's one reason they are used in power plants.
I haven't seen anywhere where recycling rare earth metals have been done near as cheap as extracting new quantities
Before last month, have you seen recycling of rare earth metals anywhere? It's been economical to recover the gold in circuit boards for five years or more now. We already have places to drop off old computers in the US. To add rare earths to the mix is not a stretch.
It is easier to change the specification to fit the program than vice versa.