Maybe that's just your opinion about exchanges or retailers that they won't buy your BTC. I think as long as the exchanges are profiting with fees in different trading pairs/markets that they have, there would be no problem with that. As for retailers, if the owner is a believer in BTC, I think they would be happy to accept it and price it according to BTC price, with that, I think it would be no problem.
That's just the problem with some of the people here, and they do not believe completely with BTC. For some, it's only a possibility to profit, not completely adapting to what it could be in the future, where it would be the medium of exchange towards different people and maybe governments. We will see.
its not just my opinion, go ahead google it, maybe ur less informed ! when BTC spiked to almost 20K over a week MANY of those international exchanges refused buying your BTC in exchange for FIAT, that was just what i read and i wouldn't be surprised, maybe u r LESS informed !...
You misunderstood something perhaps.
Exchanges don't buy your coins, they just provide a platform, buyers do. Perhaps by saying "exchanges" you're talking about a not popular website where they guy buy your BTC. In this case yes that's possible if they were not interested to buy BTC at this price.
However, if you use a popular exchange you won't have this problem. The light is always turned ON and there is always some waiting to buy your coins.