I know...there are smaller marketplaces that people can buy/sell goods via bitcoin, but why a major marketplace is not emerging??
I know for a fact, there is a huge demand for purchasing of goods with BTC...even users from this forum is enough to give the marketplace a supply chain issue

1. is the problem in supply side? are sellers worried taking payments via BTC bcas of volatility
2. is there a logistically inefficiency, that smaller sellers can never compete with the likes of amazon
3. is the transaction speed an issue for retail transactions?? major cards payments are done instantly (maybe this speed is needed for impulse purchases

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Comment below...thanks i'm a newbie here

To put it simply the demand is not there, look at what the price is doing right now, we are seeing an important growth and most of those that are buying bitcoin right now are not thinking about using it to buy stuff in the future, they are only speculating with the price and as long as that is the main use of bitcoin then there are not going to be a lot of marketplaces that are going to accept bitcoin as a form of payment, obviously this will change in the future but it will get some time for us to get there.