Even if it crashes it only took a few weeks to return from 500 to 1100. Once another big merchant takes it onboard it will go higher. People said Bitcoin was fucked and was heading for single digits after China now look at it. If amazon announces anything bitcoin will fucking explode.
The issue is bitcoin doesn't solve an existing problem. Bitcoin evangelicals are marketing it as a solution to a non-existent problem. It's not like Amazon is having problem with people buying its stuff where the inclusion of bitcoin would be a solution. If you have a credit card it's idiot proof buying from amazon, but obtaining a bitcoin is harder than getting a credit card.