The question is "is it worth it?". New scientific instruments usually come with a bunch of discoveries, because we are now able to see what we couldn't see bef

The question is "is it worth it?". New scientific instruments usually come with a bunch of discoveries, because we are now able to see what we couldn't see before, but there are diminishing returns, because we run out of interesting things to look at. Some platforms can be upgraded, like the ISS, ground based telescopes, and Hubble in 2009, so that new science can be done, but it is not the case for JWST. So I suspect that there will not be much left to do with it after 10 years, especially if it is not fully operational. It will not be completely useless, but I expect money to be better spent making a new instrument, with better technology and guided by the latest discoveries, than trying to extend the life of an aging instrument that has given most of what it could give.