The counterpoint to this (not that I necessarily disagree) would be that 2nd layers solutions add new value to the network, and thus add value to a Bitcoin tran

The counterpoint to this (not that I necessarily disagree) would be that 2nd layers solutions add new value to the network, and thus add value to a Bitcoin transaction. This is very likely to occur to some degree (e.g. micro-transactions and fast retail transactions that Bitcoin can't do), but will also cannibalize some on-chain activity. Also, altcoins present a real competitive risk; failure to maintain an advantage over them will see network value approach zero.