Please don't run me out on a rail, but how much further scientific value can we expect to get from Hubble? I know that it was the wonder of its day, and gets images with much better resolution than earth-bound telescopes. However, it seems that it has accomplished much of what it was designed to do.

It seems to me that it is time to replace the old guy with a bigger space scope with better optics, ccd's, etc. Am I way off-base on this?