Short easy answers
production of the 1M is keeping them from making more X1 models.
The plant was supposed to send X1s to the US, but the US launch of the X1 has been delayed for a year because they can't make enough for Europe and the US.
The line is also going to change over to F20 production soon.
Regardless of how popular the car is, production was only intended for 1 year in the US, this was communicated from the (now former) US M brand manager Larry Koch last January.
so.. you say.." stopping production".. they say..." doing what we planned from the outset"
