[MystroX5]

It’s not that big of a deal to current X5/X7 50i M-Sport owners as the current V8TT is a reliable and powerful engine. It was just updated for the 2019 X5 50i. 67hp isn’t going to change anything unless the M50i has firmer suspension and that won’t be a selling point to many and it may be to others.
I think those that really want a firm track oriented X5 and want bragging rights will just buy the X5M. The assumption that everyone wants a ”full M car” is ridiculous.
There are a lot buying the X7 and X5 50i that want luxurious power with a luxurious ride. Most every enthusiast that are buying the current 50i knows the M50i was coming. They are both marketed as a 50i so resale value won’t change. IMO.