I get what you're saying, but I think this is a bad solution, as I said, if anything it will just cause lots of drama.
Now then, people should be more generous to those healers that have spent potions to get them through a raid.
The real problem comes down to the frequent needing of heavy potion use that should be addressed. For example, the end rewards by class option slots potions in for end rewards more heavily on blue bar types. Increasing this chance further would be one way to help deal with this problem (Yes, we can't do that as players, but I think the core issue is something that needs to be addressed by Turbine, not us).
In any case, people can help contribute more, that's not a bad thing. But if I passed every potion I got immediately on my melees, then there would never be potions for those times when some caster does some exceptional work to save a raid and drinks bunches of potions. So that would mean I pretty much have none lying around, and the healer that used 20 potions may only get 4-5 back from the chests in passing, rather than the 4-5 from me alone, and possibly some from others in a similar situation as me.