That's 300 a year for 19 years, and you're still 14 whiffs behind. Hank Aaron's 755 homers are reachable by only one man now working. Ken Griffey Jr. isn't interested in that chase, or any other. No one will play more games in a row than Cal Ripken's 2,614 games, either. No one has to.
Players are bigger, stronger and faster.
They're not more hungry. They're not working in the post office in the offseason to support the wife and kids. They don't wonder about career changes or job skills or how to provide for their families when they retire. They just retire. Pete Rose had 690 hits after he turned 40.