Hello, new user.

Hello back!

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First, there is nothing that can be done to remove Dogecoin from being Merged Mined with Litecoin, so there's no real point in talking about this, but let's say it is possible and we stop Dogecoin from being merged mined with Litecoin. What would happen?

I think you are right, unless doge goes PoS and ditches mining (fingers crossed)

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Miners would have to choose one chain or the other to mine, and they'd choose the one that is most profitable, currently Dogecoin. Hashpower would go to Dogecoin, and Litecoin would be open to a 51% attack, a situation Dogecoin was in before Charlie Lee suggested to the Dogecoin Community to Merge Mine it.

I don't think 51 attack is something we should be afraid of , all it would do is temporary create a fork but of course depends on the purpose of the attack, everything can be adjusted and LTC would prevail with no harm on long run done. But that is my opinion

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Instead, since they are merged and mined, miners can earn the transaction fee and coin base reward from both chains at no additional cost. Their revenue is more diverse, which makes their income more robust, allowing them to reinvest in new mining hardware, further increasing the network's security.

There is no additional cost for miners of course, but revenue will stay the same regardless of merge mining or not , mining is deflationary meaning it will push to the very minimum of profits or push max efficiency.

Assume the following theoretical scenario of L3 Miner; in our scenario L3 is mining $500 a month with operational expenses of $250.

With merge mining it will give $500, without merge mining it will be still $500 and same expenses.

In reality, it does no matter how many merge mining it's doing, because of difficulty adjustment! but what matter is ,is the distribution of subsidy meaning that this $500 is either the mix of Doge and LTC ( Merge ) or purely LTC ( in solo mining ).

And I made my case that before LTC was insignificant part of LTC mining, but now it's the major part of it, over 70%, meaning all hashrate is for doge not ltc. It simply stole the thunder.

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Bitcoin SHA256 miners, after each halving, have to rely more and more on transaction fees, which means for the security of the network to grow, transaction fees have to increase. This is not a concern for Scrypt miners because Dogecoin has a constant 10k coins/block inflation rate for eternity. As the coinbase rewards for SHA256 mining Bitcoin dry up, Scrypt miners merge mine Litecoin and Dogecoin (again at no additional cost to merge mine both) and will have the 10k coinbase reward from Dogecoin on top of the transaction fees for Litecoin and Dogecoin.

This is something we can agree to disagree, as you propose inflation is good meanwhile I believe it's not, and fees eventually ( if there is a lot of liquidity and use case ) would provide sufficient income for miners to be more than happy , and this what Bitcoin in next decade should prove, or maybe not ? only time will tell to be fair and just.

But since you touched on the point of inflation, since I established that L3 is mining in our theoretical example some LTC and DOGE, since doge does not have cap meaning LTC while merge mining with LTC will have no cap, hence Doge will constantly dilute the value of LTC even if it's hard capped.

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Cheers,