http://alphaflight.net/content.php?5...-Sales-Figures
#1 - 46,851
#2 - 26,862
#3 - 24,872
#4 - 23,242
#5 - 20,731
#6 - 19,316
#7 - 18,416
#8 - 18,408
so a 28,443 drop between 1-8.
Had it carried on around the 40,000 mark (like Uncanny X-Force is) it would have kept ongoing.
Looking at it, by #5 it had reached the point that Astonishing X-Men is at now and that too is being cancelled.