Sport evolves, its a fact of life...doesn't mean its ruined
A revolutionary coach/manager will come up with a ploy to destroy the blanket (high press / direct running / attacking from deep / high balls to big FF, whatever)....
or the rule-makers will outlaw it by tinkering with the game (baby steps in this regard).
Either way, the game is not destroyed....it just changes! I for one enjoy a tight defensive Ulster championship match just as much as a shoot-out in Munster...for different reasons.
Lots of sports have been through it, and life goes on.
Golf - make holes longer or tighter, rules re clubs/balls....etc
Rugby - loads of rule changes over time...
NFL - the proliferation of the passing game due to rule changes and safety concerns.
Tennis - changed the balls when big servers were taking over too much..
Cricket - one day formats.
Soccer - back pass rule, changes to offside...