After all i think BTC will die and Lightning network is not necessary
The lightning network is necessary because next time people will rush again for bitcoin it will be a much higher demand for bitcoin compared to the end of 2017 (noone knows when it will start again...). That time the mempool was full and the transaction fee was high (higher than before, ever). Now those days are over and we have a kind of grace period, which is good to prepare for the next rush...
It's easier (and cheaper) now to test opening and closing the channels when the mempool is nearly empty, so it's good for the development too.