tldr; RPL annual inflation required is very likely under 2%
Uniswap v3 is an orderbook. We only need limit orders that buy rETH (possibly at discount). We do not need limit orders that sell rETH as people who want to market buy rETH can deposit into rocketpool instead.
Assume Rocketpool has total X ETH deposited assigned to validators. About 0.5X backs rETH and 0.5X belongs to validator owners. Assume RPL market cap is Y ETH. By necessity, Y > 0.05X, so X/Y < 20
As of today, X = 22k, Y = 180k. Y is not just greater than 0.05X, it is even greater than X.
Assume we want r fraction of rETH to able to exit their positions at any given moment.