The way I see things, folks who buy the Eco Boost 4 and the V6 will spend lots of money for power upgrades likely far exceeding the cost of buying the Coyote 5.0, but not achieving the power of the stock Coyote.
Another concern I think about is the mean time between failures of the turbochargers. I doubt that the Eco Boost will have the reliability of Coyote or the V6.
I would like to see the how the Eco Boost Mustang does in a drag race against the Camaro V6.
Some may, most wont.
MOST people do not mod their cars in anyway shape or form.
If you ARE going to mod your car and/or race it, the 5.0 is the best option and still a good value.
I doubt many will dispute that.