Common Core assessment support faltering?

Education Week reports on August 7 that several states are ending relationships with PARCC and/or Smarter Balance.  Per Student Testing is the major concern as is technology.  And, ACT is building a competitor -- called Aspire.  What will come of this fragmenting?  How will states be compared when there are a large number of different tests for the CC?  Kentucky is already suggesting they'll make their own with items from ACT and PARCC and Smarter Balance.