Over at Beyond the Box Score, xanthan takes at look at historical Wins Above Replacement to see how long it would take some current players, at their career rates, to catch up with Barry Bonds. For A-Rod, it's about 9.6. For Pujols, it's 11.42. For Jeter, it's 21.51.
Some joker asked about Mike Jacobs. Hey, it could happen... check the comments for the number of seasons it would take Mr. 32 Home Runs.