"established wisdom" is a correct and usable phrase in written English.
You can use it to refer to something that is generally accepted as true or valid. For example, "The established wisdom of the day suggested that the economy would remain stable."
It is established wisdom that Albany's budgeting process is broken.
Instead of challenging the city's established wisdom about where to eat, the guide mainly parrots it.
(Despite Grayling's actions, this is still established wisdom. Even a minister cannot unmake the truth).
Particularly helpful was a 1992 campaign that overturned years of established wisdom on caring for infants.
All that is common there was that large segments of the population in two countries did not follow the established wisdom.
Only when you study the speeches in detail to assess whether in fact they have delivered – do the oddities jump out: the forgotten boasts, or wrinkles in established wisdom.
They tend to assume that established wisdoms or party lines are just that — party lines — and that they are being lied to, that the world is a much darker and more complicated place than Americans realize.
The conventional wisdom, established under New Labour, is that electoral majorities can only be won from the centre.
On the other hand I expected that your equally well established hard-headed wisdom for unintended consequences would tip you the other way.
Baltimore is where Rex Ryan, the Jets' talkative rookie coach, established his defensive wisdom as a Ravens assistant, and where Weeb Ewbank had coached the Colts to two N.F.L. titles before joining the Jets in 1963.
It is important to remember that in many cases he's the one who established the conventional wisdom, such as the now-commonplace idea that offensive linemen are highly skilled creatures rather than mindless grunts.
