I can't understand the meaning of this sentence:
This is a sad sight for Mediators’ friends, who will come to depend on their rosy outlook.
The complete paragraph is:
Unlike their Extraverted cousins though, Mediators will focus their attention on just a few people, a single worthy cause – spread too thinly, they’ll run out of energy, and even become dejected and overwhelmed by all the bad in the world that they can’t fix. This is a sad sight for Mediators’ friends, who will come to depend on their rosy outlook.