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Maybe it is time to think of non oxygen oxidizer fuels source. Such as the story that ran last month on fuels for Mars which used magnesuim oxide rich soil and carbon dioxide with an iodione catylst.
The biggest problem with Hubble is not the repair but is when. The actual reason that anything is being done in the first place is that it will come down on our little heads if nothing is done.
With Nasa's budget constantly being stripped or lowered it makes it very hard to do anything but to maintain those programs that are already in the pipe line.
Hubble is definitely worth saving but there must be a limit to the cost. Also Nasa must always design into any probe that circles where ever. The ability for a clean deorbit if it wishes to have safety, or no contamination to the environments that these probes circle to not be impacted.