I'm not quite sure the Mustang brand is all that strong to begin with...I really dont like the look of any SUV, never have and doubt ever will. When our kids were little and we wanted something to take them places and drive around stuff I always went the minivan route and would never change that. SUVs to me were always larger on the outside then they were on the inside. I could get a 4x8 piece of plywood in a minivan with the seats flat or out. Other then some monster SUV could never do that. As for Y or E. I hate the hood and front of the E it just looks fat. I also havent liked the look of Mustang's since the 70s. Not that a Mustang Mach-E is a Mustang. They made it a CUV because Ford was scared &#!@ less that people would like it more then a Mustang and they cant afford to sell a lower margin better version of the Mustang.
Ford's sales of the Mustang was down 17% in the 3rd quarter of 2020 sales compared to the same period in 2019. The Mustang brand only sold 4,636 cars in Canada and 61,090 in the US for all of 2020.
https://media.ford.com/content/dam/fordmedia/North America/US/2020/10/02/ford-sales3q-20.pdf
Ford Mustang Sales Numbers, Figures, Results