I think every member of the bitcoin community should ask themselves the question, what color is their current bitcoins
I think every Bitcoin user should have color blindness in that matter.
The favorite mantra of bitcoin maximalists "1btc = 1btc" does not work because the coins in the open blockchain are not fungible.
I strongly disagree. There are abundant bitcoin buyers and sellers who are willing to exchange bitcoin without questioning the coin history at all. That alone should be enough to consider it fungible. The fact that some companies enforce a view in which some coins are worth less, doesn't mean they really do, because there are people who don't buy this view, and still are willing to buy / sell them for the same price.