"imminent decade" is correct and can be used in written English.
It typically refers to a future period of time that will soon arrive or begin. For example: "The start of a new decade is imminent, and many exciting changes are expected in the coming years."
Some people are indeed saying that, but as far as I can tell, they're all people who have been predicting disaster every step of the way, and will still be predicting imminent collapse a decade from now.
This is in many ways a slow-motion crisis — decades in the making, imminent for some, years or decades away for others, hitting one farm but leaving an adjacent one untouched.
The message was unmistakable: the rules that apply to the rest of Egypt do not apply to the military, still the single most powerful institution in an autocratic state facing its toughest test in decades, an imminent presidential succession.
Indeed, the "battery storage revolution" that has been promised to us has been "imminent" for not just decades, but really centuries.
As regulations regarding emissions of greenhouse gases and air pollutants will become stricter with the turn of the decade, change is imminent.
But many longtime advocates for reining in the industry remain unconvinced that federal action is imminent after more than a decade in which privacy controversies have failed to generate meaningful new laws.
Despite a decade of predictions about imminent global conversion, IPv6 adoption has barely begun.
Its certain death and imminent rebirth have been alternately predicted for decades.
Foreign courts have ruled that living for decades under the threat of imminent execution is a form of psychological torment.
Hundreds of thousands of Afghans, dependent on food aid after drought and decades of conflict, now face imminent starvation because aid channels have been cut by the war.
