I am in the same boat. Hit 75k MVP this year. Based out of ORD and fly west about 60-70% of the time. With the AA partnership ending, I am in the same situation. Honestly not to sure what I am going to do.
I was thinking about doing a AA Challenge, but I really like Alaska. Just not sure if it is worth it to continue down only Alaska, and I would have to bank miles in another program when I go east with 0 chance of any status over the course of the year.
1st world problems for sure, but traveling 75-100k per year makes a difference. Oh what to do...