Like saying "it just needs to work until Longhorn ships" ;)
In any case, JWST doesn't have UV capability, so it is not a straightforward replacement of what Hubble does. It just able to look at more distant objects because they've all been red shifted into the IR.
JWST and HST are not comparable telescopes. Moreover, the idea that astronomers would stop using one world class telescope just because another one (even a better one) exists is sheer lunacy. Even if a space telescope that was worse than Hubble existed it would still be completely 100% booked in terms of observation time, because there is much more demand for those capabilities than there is supply, by orders of magnitude.
Sure, but the jump is still tempting for the scientific top brass. There's only so much that can be learned in the visible spectrum and only so many Noble prizes, PhDs, tenures and grants to be had. Staying on Hubble is scraping the barrel when the new sexy JWST promises to open whole new fields of scientific inquiry.
Like saying "it just needs to work until Longhorn ships" ;)
In any case, JWST doesn't have UV capability, so it is not a straightforward replacement of what Hubble does. It just able to look at more distant objects because they've all been red shifted into the IR.