1. Lock all addresses that had no outgoing transactions for let's say 2 years.
2. Starting with block X make it so that Y IXC ends up taken from all such addresses, per block, and given to development fund, miners or both.
X and Y are subject to debate.
Such feature would ensure, if nothing else, that all IXC lost somehow are gradually back into circulation.
Do not be a chicken and avoid messing with blockchain. ETH said fuck off to thief, rewritten blockchain and it is doing just great, just check it.
And yes, put more coins up for sale, improve liquidity.
Agree with the liquidity problem - but not your presumption of the cause. There are a couple of necessary but not sufficient characteristics. 1) Distribution - definitely an issue here but there are some options after the hard fork - see my posts above. Lots of people with different needs and goals will increase the need to trade and liquidity 2) Real use cases - Need to have a reason to go in and out of the coin via exchange and speculation alone is not a long term solution. 3) A reason - crypto gold, touring completeness, you get the idea....
ETH got a lot of buzz by being more programmable, pretty widely distributed, and had a killer use case in EC20 tokens to raise funds easily - the added bonus is all EC20 token have to go through ETH and push up demand for ETH - I would argue that is the primary use case and main driver for ETH price. The hard fork to recover funds is NOT a plus - any two bit regulator can come along and compel a hard fork or at least try since there is precedence.