Have played the Tenbury organ at least once a year for the last five+ years. It's in a good playable condition at the moment (played last weekend!), and I understand that the present condition is down to the organist (Michael Hart) and the support of the PCC.
I don't know who maintains it, but I think that the chances of it staying playable in the future are good, as the church recognise its importance in the scheme of things. The building itself is being renovated at present, with attendant drain on parish finances, EH and other grant support notwithstanding.
Having said that, it would be wonderful to see a top-to-bottom restoration to seal the myriad wind-leaks, renovate the action and clean everything, one day. Agree that tonally it should not be touched. A wonderful instrument!