Yes, Dai should be removed from the Curve Pool. I favor a sUSD to USDC and USDT pool.
It makes little sense to provide SNX incentives to subsidize liquidity for DAI
DAI collateral types are centralized (USDC) and illiquid shitcoins (BAT, among others), introducing centralized risks to every circulating DAI. Garbage in, garbage out.
USDC and USDT are more liquid, have better network effects, and routinely maintain their peg more effectively than DAI.
While there are differences between USDC and USDT measuring characteristic by characteristic, they are both centralized, widely used among DEXs and CEXs, and have a pretty good system of redemption for dollars, even if the censor bug is ever present.
By comparison, the DAI does not have a very good system of redemption for dollars. DAI are not redeemably by anyone in the MakerDAO ecosystem, but only by the CDP holders. What if a CDP holder went off the grid for two years, then what? If that CDP holder minted 1M DAI, it would be impossible to redeem 1M of the circulating DAI supply for those two years. USDC and Tether don’t have these clunky redemption mechanics. (See https://medium.com/@ministry_of_agriculture/a-little-unsteady-55ca9e4c6440)