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?
Why not? It's not like fiat to crypto trading pairs don't exist yet.
And if not how could they stop CBDC from hitting the markets?
Define "hitting".
What type of effect would that have on the entire cryptocurrency market?
More trading pairs and more liquidity?
Also who would want to hold CBDC when they see cryptocurrencies going up in price and obviously CBDC reaming/acting as a "stable coin"
The same reason why some people hold USD and stablecoins and not bitcoin/crypto.