... player that will not find himself replaced on the roster at some point in time; it just happens at different times for different players.

The Detroit Lions have no shortage of players on their way out the door, though many of them contributed last year, and will next year.

But time marches on, and it sweeps up dozens of solid NFL players into its wake every year.

Be it free agency, aging or roster improvement, every one of the players on this list has a justifiable reason why they may be irrelevant to the Detroit Lions three years from now. Given the Lions' turnover in the last two years, it's tempting to say there will be a lot more...

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