If it fails someone will have to identify the reason(s).
And it could well become a case of find a suitable person/company. I somehow suspect that "time" will not be identified as a cause.
It does seem to have become a "hot potato" as the saying goes. If I were an insurer I think I would pass on covering this one.
Will the opening of the mirrors be "close" to earth or out at the Legrange point? Either I expect means no maintenance option - no shuttle. Wonder if someone should have pulled the plug and made a decision to put the resources into the next generation of shuttle craft. Outcry at wasted time and money up until that point but could have delivered greater benefits.
Is James Webb still around?