well, although I do understand your reasoning and intentions, I do not think that it is very likely that Amazon would bother to consider such petition at all. They are rather interested in using their own payment system. that's why they have developed and implemented it in the first place, avoiding usage of PayPal, which at that time belonged to their rival eBay. so, why would they now abandon their own well established payment system?

I guess the maximum what they would do is to setup some sort of "pay-gates" similar to Shapeshifter or Cryptonator, and / or some exchangers, possibly their own, which would enable concerned buyers to conveniently change their LTC or other crypto-currencies to their payment system.

Banks and corporations do not give up so easily, especially just because of a few petitions! :)