So I have been thinking about this a lot, and I just don't see any way polyCUB will be sustainable over the longer term at all (despite what Khal has been saying). Ultimately, polyCUB provides no service that people will pay for to drive value to the token. It's purely based on earning yield. The only reason to buy the token is to earn more of the token.
The same is true of BSC CUB, but that had continued inflation at a constant rate and was still slowly losing value over time and only gained value when additional things were added such as IDOs or airdrops. Since polyCUB will very quickly run down to zero inflation, and it doesn't have any planned other things to drive demand (IDOs, airdrops, etc), I don't see why there will be any buying demand at all.
I understand the idea of the protocol owned liquidity which will earn yield that will be used to provide buying demand for polyCUB, but unless I'm missing something I can't see how that will be any significant amount of money or how the "risk free value" of polyCUB could ever be more than maybe a few cents.
I would love to see some numbers around the PoL from the team, but the way i understand it, the PoL gets 10% of the yield from the tokens in the kingdoms. If we assume $5M in the kingdoms, then assume that the yield on that is 10% (which is generous), and then polyCUB gets 10% of that - it comes to $50k per year in PoL, and then if that PoL earns 10% yield it comes to only $5k / year in polyCUB buybacks. Please let me know if I'm missing something here.