I suspect this is much more to do with the delays and instrumentation problems pushing JWST back and affecting its mission than a vote of confidence in being able to operate HST effectively for another 5 years. Of course as long as its flying and pointing there's plenty of imaging it can do, and not without research utility, but the reality is that it offers too limited an instrument suite for the cost and rarity of its observing time. Modern ground based AO has made it nowhere near the killer scope it once was.
As for bringing it back: what in? Ditto maintaining it: with the demise of the shuttle there is no service platform available for it, so it may well not even make 2021. My guess would be it'll wind up a very expensive camera for making nice APODs and "keeping space warm" for americans. (My gut says it already is, but I may well be wrong). To my mind that's actually quite sad: pretty pictures on their own do not constitute science, their value is in outreach and education. But those goals can be achieved by other instruments (like, the very nice ones owned by members of this forum, for instance) which don't suck quite so much money from other, higher value-for-money projects. Or they could just divert all of its funding to TESS or a NEID-South
