They may well be much loved and life blood, but that is not to excuse the managing trustees (in what ever form that might take) from their fundamental (and - depending upon what form it takes, charitable trust for example, legal) responsibilities for long term sustainability, maintenance and financial viability.
Without, or with sub-optimal, medium to long term strategies, and that really must at least be some attempt or even pretence of financial independence, then they are in any case doomed.