Keep her for another 10 years? Hell, if she's driving, she should be out of the house in two or less...

John, i'm kinda under the impression that the steel will bend to failure, not really just shatter. Why not get under the car and see if you can patch-up the pan with some jb-weld or similar? I would be willing to do a whole lot of welding/jb-welding on the pan before I went to all that expense of removing the pan. You only need to make a seal with the repair, it doesn't have to hold for more than a half hour or so of non-pressured operation. As long as the pick-up tube isn't obstructed, you should be ok.

Assuming of course that no dirt-rocks got into the pan through the tear-in this case by all means to a r/r...

cheers,
dan