Lincoln needs v8 power, whether it comes in the form of a V8 or not - or they will fail. If the MKS is going to be slow, it's going to fail.
If they redesign the Town Car, I certainly HOPE they don't make it any more narrow. It's fine the width it is. Long cars are fine but width is important too. My Fleetwood Brougham was even an inch wider and that made things very comfortable for three people in the back seat. Unless a luxury car is going to have three rows of seats, narrow isn't good.