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I assume they're giving everyone 2.5yrs advanced notice to port anything considered important to something else.

Important to what? Individuals? Digital historians? Those concerned with abandonware? Companies that want people to pay for new porting work?

The majority of content that is still in flash and active use probably won’t get ported... the iPhone 10 years ago set that trend.

The flash player won't stop working when Adobe declare it EOL....

Meanwhile, DOS programs from 1986 still run in DOSBox.

Given enough demand, the same will be true for Flash thirty years hence.