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Hi,
Hubble needed a hardware replacement before it was able to produce what we see today, this involved a shuttle mission.
As for the James Web
quote
'A Solar Orbit. The James Webb Space Telescope will not be in orbit around the Earth, like the Hubble Space Telescope is - it will actually orbit the Sun, 1.5 million kilometers (1 million miles) away from the Earth at what is called the second Lagrange point or L2.'
it will be far too far away to ever be serviced from Earth, so they need to get it right first time.
Cheers
Paul
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