What if the size limit of the next block would go up if the average transaction fee goes up but down if the amount of transactions goes up. If a miner would try to play the system by filling his block with fake transactions then he would have to mine 2 blocks for the price of one which wouldn't be profitable.
Or a coalition of pools will play it the other way around.
They would insert only fees with low transactions into their blocks thus making the next block smaller but if filled correctly would trigger the next block to be larger and they could stuff also higher fees in this, you can't force miners to propagate a block they find if they don't want to. Of course, it will need also quite a bit of luck alongside hashing power but they could still try to game it, this will turn ugly once the fees will be the dominant reward, miners will have an incentive for selfish mining.
In the end, it's normal if you open even the smallest door of opportunity someone will try to make more money than the others.
LTC can move large sums safely and as a bonus cheaper then Btc.
Doge can move small and medium sums faster and cheaper and safely.
That's because they are not used. It is like saying I can speed in this street that nobody else is in but I have to be stuck in traffic in the other street that is the exact copy of this one but it is used by a lot of cars.
Let' be realistic here, even if they would have the same number of transactions as
BTC, doge fees would be cheaper, two cities might have the same time wasted in traffic on average but if we reverse the number of cars one might go to zero time wasted and the other to a complete stop. Nearly all the transactions you see on those chains are exactly because the fees on BTC are too high, if everyone would be using the LN then there would be no reason left for their existence anymore.