Maybe. Maybe not.
The "reddest" of all states this election cycle was Utah. They went for Romney 73% to 25% for Obama. The second reddest state was Wyoming (Romney 69% to 28%). And the 4th reddest was Idaho (64.5% to 33%).
These four states (including AZ) are contiguous, and could form an alliance or grouping.
And, of course, Wyoming borders the Great Plains states, which could form an alliance or grouping with Texas.
So Arizona doesn't necessarily have to be "blue-blocked."
You've got a point there. If worse comes to worse, I hope to see the red states in secession be contiguous.