And like it or not no one knows if LN network kills off mining or helps mining down the road.
I promise I will stop making this point over and over, but I am going to try one last time.
Lightning (or ANY OTHER scaling layer/solution) cannot 'kill off mining'. It's sort of a catch 22 but positive.
You only need lightning if blocks are full (and for instant settlement). If blocks are not full people will not need to use lightning.
Lightning will KEEP blocks full. Lightning service providers are going to compete on the base layer to write settlement transactions. For the entire world!
Individual users are not going to want to pay the sort of fees necessary to keep miners supported as the subsidy wanes, but layer 2 service provider certainly will.
I honestly cannot figure out how you are scared by this.