So if a new monetary system is set in place after a financial collapse and they start to issue CBDC, do you think exchanges will accept them and open markets where they are paired with cryptocurrencies?
First and foremost, the change is not necessarily systemic. It's just
form which is changing. The central bankers are still there holding the most powerful positions in terms of money generation and issuance. There might not anymore be
printing of money out of thin air, but it is only because
printing is already replaced with
minting.
And, yes, crypto exchanges won't have other choice but to accept them because they want to offer fiat pairs one way or another.
And if not how could they stop CBDC from hitting the markets?
They won't stop CBDC from reaching the market. CBDC is the default money, the one used by the state and the population. How could they even stop that?
What type of effect would that have on the entire cryptocurrency market?
Nothing much. Again, there is nothing essential in the shift from the old form of fiat to digital fiat.
Also who would want to hold CBDC when they see cryptocurrencies going up in price and obviously CBDC reaming/acting as a "stable coin"
CBDC is the legal tender. You may not prefer to have your savings in the form of CBDC but everybody has the reason to have a certain amount of it.