Large companies pursuing agility should ask this question: What do we want from agile, and how long do we want it?
As a company, we sustainably adopt continuous-improvement techniques (iterate, measure, reflect, and adapt) everywhere to rapidly identify market need, explore demand, establish product plans, deliver products and delight customers, and support employees, so we gain greater profitability indefinitely.
Agile practices are surprisingly fragile: you can lose them with a manager resignation and/or a bad hire.