I agree from a consumer standpoint to give the Fusion the 3.0, however, poor Lincoln really needs something/anything to get people into the dealerships. Losing the Town Car was a crushing blow that they have not recovered from. Every model left is cross shopped against the Ford dealer down the street and the vast majority of customers go for the $10,000 savings and buy a lower optioned Ford.
Lincoln needs this performance advantage.
I'd like to see a come back of the Mark Series with a Mark IX based on the 5.0 Mustang. It's a great chassis that could support being Lincolnized. That being said, a midsized luxury electric car would probably bring them the most recognition. Something to compete against Tesla, but at a mass produced dumbed down price.