I have few concerns regarding this, say BTC does Hit 100k suddenly (like it did when it jumped to 19k about a year ago) at some point, will Any Exchange actually accept buying my ONE (1 BTC) and give me Cash

?.....
Which Trusted International Exchanges should I deal with to sell my BTC in exchange for Fiat ??...
I am from Dubai, we have here a website called Bitoasis, but am hesitant, I have a feeling that many exchanges will refuse buying my BTC for real cash WHEN BTC hits huge numbers 30-100k $...
plz correct me if am wrong...
Unless it is a very shady exchange that want to scam you with your BTC.
Technically exchange is not the purchaser of your BTC it is just acting a medium between buyer and seller and taking there fees in between. They are not the owner so it is not the correct question they should pay.
They are in strategic position where if they got bad intention they can fled taking away others cash and BTC .
So you should keep your BTC on your own wallets (not in the exchange) and deal with the trusted established and regulated exchange when you want to cash out. (But I guess easier way is to buy the goods directly using BTC as mode of payment and you have no worry about exchanges.)