In v5, the protocol has a virtual AMM, where yield is liquidated for POOL–previously outlined in this forum post and the early dev docs for v5 go into detail on this process.
The POOL POL managed by the Finance Team will be enough to manage the trade volume post v5. You can read the POOL Liquidity Considerations April 2023 post here for more information on the current POL positions.
If v5 had $200m TVL with average yield of 5%, then there would be ~$27k in yield that would need to be liquidated every day. Well within the capability of the current POL positions and that would be in a scenario where TVL sees a 20x increase and yield sees a 2.4x increase.
Getting a token listed on a centralized exchange typically costs money. Custodians only want to list tokens where there’s a financial incentive for them, which means people either have to pay large fees (in the range of 6-7 figures per year) and provide liquidity for marketing making. This is likely something the community would not want to use treasury funds for, and it would be unsustainable if a six-figure sum were paid for a custodial listing.
TL;DR: the POL positions will be sufficient to support POOL trading; once networks are identified for v5, POL will need to be established on those networks, as well.