I've been shooting the EM1.1 for the past three years now, and I have enjoyed doing so for the most part. I still have my D300, which is for the times when I want to shoot something with very good AF on fast moving objects (which isn't much lately). The OLY form factor is great for travel and biking, family gatherings and teaching myself macro, which is mainly what I'm doing now.
Experience with the OLY IBIS has made me a convert to this type of stabilization and the quality of the OLY 12-40 PRO is awesome IMHO.
So a move to another camera is fully discretionary, I don't need to, but if wanted to, I can. Not the M1X for me, and I doubt that I am its intended customer.
I had a chance to have some hands on in the store with a Z6 today. If I was told I could have either one, the Zed wins. The skin tones and image's (even with bad photographs) are to my eye, almost perfect. And the buttons, BBF, are almost exactly where I want them. (I'd prefer the front dial be higher like my D300/EM1.1. But I picked it up, configured to my D300 set up in a snap. It was considerably easier than doing so with EM1.1 the first time, but it was possible).
There is no value in my D300 for trade in, so it will hang around for a lot longer. But I will be saving my nickels (no pennies in Canada) for a possible addition.
OLY makes quality products, so I hope they realize the goals they may have set.