Some people will never learn no matter the kind of impact you want to make in them by given them quality lesson to why they should not involve in memecoins they will always allow that greed in them which always convince them that quick money can be made out from meme coin to control them, some can only change and stop investing in meme scam coin only after they have falling victim into lot of scam that’s hard for them to recover from.
The only medium through which people could be discouraged from gambling with their funds into memecoins is when the "get profit quick" feature has been removed from memecoins. But so far as they are made to understand that there's a slim chance of making huge profit in the shortest time from it then they would never stop risking their money there, except as you said it, only when they might have lost way more then they can stomach and that's when they start avoiding it but by then they have lost funds they could have used to start with real asset that has sure potential for a ROI no matter how small the profit could be.
And you are I know that their is no way that the get risk quick marketing strategy can be remove from memecoins, infact I see that as the ideology which they are using for creating such coins, without the believe and hope that anything can happen and those zeros in the back of the little value it have can be reduce and investors can be rich over night, even till date that it’s already a known fact that Bitcoin is not a get rich quick scheme people still rush to invest in bitcoin with that idea on every bull run new investors do rush into the market so that they can get something out of it, with such people with such way of thinking around I don’t think they will ever stop investing in memecoins.
Bluntly speaking I have had my own fair share of investing in the wrong places although that was some years ago and I don't think I will want to cheaply make those mistakes again. I rather stay for a cycle with bitcoin where am certain of getting some returns in my hodling just within that 4 years than doing otherwise. Without experience many people wouldn't know how to take the right investment decisions and even if they see the right assets to invest in they would still have excuses not until they get burnt from the wrong places.