I see a lot of people pushing for companies like Amazon to accept Bitcoin as a payment option. Have we considered the
implications of these decisions? Let's say we cannot scale to "service" the need for millions of new people who would use
this technology for the first time. What a big embarrassment would it be, if people waited 13 hours for their transactions to
be confirmed. Doing this now will hurt Bitcoin more than any other "bad" thing that has happened to it before.
We need to wait for the perfect scaling solution to address this problem, before Amazon or any other big retailer starts to
accept Bitcoin as a payment option. The Lightning Network might get us close, but it is not a proven technology yet.
Let's hear your thoughts on this?

I dont see any much disadvantages in Amazon accepting Bitcoin as a payment method except that transaction takes a few minutes and not hours like you said. If Amazon accepts Bitcoin, it will raise peoples interests and lots of people would love to try out Bitcoin and see how it works.
And by the way, the time it takes for your transaction to be confirmed depends on the fees to chose to pay; priority or regular fees. If you choose priority, your payment will be processed faster.