Runes can be time consuming to acquire especially the specific runes players may be looking for, meanwhile the blind well serves no purpose other than completing bounty’s and getting your new subclasses. But for players who would rather participate in the newest content the bind well is pointless to play. What I propose is while a rune finder is active at completion of tier 2 or above the chest should have a Chance of dropping runes. Thus giving old content new purpose as giving players who perhaps don’t want to play crucible or strikes etc.. another way to farm runes.
I already have Like 50 of each rune from iron banner and strikes, I don't think we need any more sources for them.