A newspaper article on Britain' s unions argued that their strength was declining  The article' s evidence was the decreasing number and size of strikes, as if the reason for the unions' existence was to organize strikes  Surely, in a modern industrial society, the calling of a strike is evidence that the negotiating position of the union was too weak  Strong unions do not need to call strikes
They can concentrate their efforts on working with others in the labor market to achieve common goals, such as profitable and humane working conditions
There is no reason to believe, on the basis of what the newspaper article said, that union strength in Britain is declining.