I was renewed but I do not think it is solely based on spend
they want to see a variety of IC locations too and your past history must have some weight (even IHG is not that illogical to ignore that)
if there was an IC in the location I was travelling, I usually booked it, that was the best I could do
I did not count my actual IC spend or nights but guessing I was around 10k and 40 to 50 nights
in 2017 I still booked HI, CP and Indigo for total of EQP 16,000
in 2018 will avoid most HI ,HIEX and Indigo but I have had good luck at some CP properties, almost RA treatment
best of luck to everyone in 2018