The US dollars changes might affect numbers. Stable International sales might be reported as more dollars. If the US market drop it does not means that price of the cards will go down as much because people will begin to order from outside the US. I was buying the booster box around 145$ canadian a year ago and I was able to preorder boxes for 125$ canadian for the D&D set so the money left will probably go to buy more cards. For the bubble to blow completly you need other countries to also go in trouble at the same time.
How much lgs will fold this year when programs to help them will finish might have a bigger impact. A lot of them have loans from the COVID that will need to be reimburse at some points. It might provide a source of sales lower than the price of the market so they can encounter their payments or liquidate.
I suspect that most of the big investors are in the US because it is easier for them to have insider information and know people that works at Wizards. Most of them will probably kept their cards if the bubble burst and stay the course because they did not reach that summit by panicking. If they have cashflow they might increase their buys to benefit from the lower price.
A lot of the investors that began collectings cards in the 90's will go to their retreat in around 10 years and will start reselling their collections slowly. This will be a factor that will contribute to the price of the cards in some years but not yet.
There is a lot of other factors that will impact the price this year so it is not as easy as saying that the US economy might go bad or that people might begin to spent their money outside of games now that they can go out.