I don't know if the Hybrid is a barrier, the MKZ comes stock with the 2.0, and the 3.5 N/A v6 is the current upgrade, but if you want the bump in power you need to opt for AWD as well.The MKZ does already have the hybrid version for the same price. That is the one thing I can see standing in the way of an EcoBoost for the MKZ.