How do if the Bitcoin Sending Fee will be super high or super low?

[o_e_l_e_o]

You can just use your Bitcoin for transactions over $100 and for less then $100 you use doge or eth or ltc or something. Many more places have now accepted altcoins and have a drop down menu to select them.

This doesn't help unless you have pre-bought various alt-coins in advance. Changing them on the fly with something like Changelly would cost more in conversion fees than just making the bitcoin transaction and paying a higher transaction fee. You also run in to the problem of different vendors accepting different alt-coins. What if you aren't holding the right one at the right time?

On the whole, the much simpler and easier option is to start using Lightning Network. More and more vendors are now accepting LN, you can open a channel when fees are low and then spend whenever you need to, instantly and cheaply, regardless of what the current mempool status is.

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[Vinalians]

This is also one of the biggest problems of bitcoin right now, the fee. Using bitcoin when the value is cheap is a big advantage because the fee is also cheap. When the value of bitcoin increases the fee increase also. I just hope that in the near future the developer would solve this.
I suggest that you would do the transaction whenever the value of bitcoin is not that high or expensive.

[squatter]

On the whole, the much simpler and easier option is to start using Lightning Network. More and more vendors are now accepting LN, you can open a channel when fees are low and then spend whenever you need to, instantly and cheaply, regardless of what the current mempool status is.

How many people are using custodial wallets like Bluewallet because they don't want to manage an online node and channel liquidity 24/7, though? This seems really common, but I don't know that there are any statistics about this. Hopefully Watchtowers and better UI in non-custodial wallets will turn the tide towards better (trustless) practices.

If the choice is between holding/using an altcoin and using a custodial LN wallet, the latter doesn't seem any better.

[Mike Mayor]

You can just use your Bitcoin for transactions over $100 and for less then $100 you use doge or eth or ltc or something. Many more places have now accepted altcoins and have a drop down menu to select them.

This doesn't help unless you have pre-bought various alt-coins in advance. Changing them on the fly with something like Changelly would cost more in conversion fees than just making the bitcoin transaction and paying a higher transaction fee. You also run in to the problem of different vendors accepting different alt-coins. What if you aren't holding the right one at the right time?

On the whole, the much simpler and easier option is to start using Lightning Network. More and more vendors are now accepting LN, you can open a channel when fees are low and then spend whenever you need to, instantly and cheaply, regardless of what the current mempool status is.

If you planning and making purchase in other altcoins you just plan ahead and buy some and use them as you need. Most people should have various coins if they serious about cryptocurrency.
LN has been spoken about for months and it's still not an option. If people don't hold eth then I don't even know what to say since you need it for token transactions.

Ideally you should be able to use any currency with similar fees. So like you say you don't have to hold the other coins.