Is the plan to secure a fully-mined chain just rampant value-inflation in a way that is completely detached from supply and demand? Today my 1e-1000 bitcoin is worth 10 carrots, tomorrow it is worth 20 everything else held equal? How does that even work in practice?
Alternatively you need transactions to pay entirely for the security of the chain. This doesn't seem feasible when chain security costs rise everyday as the cost of energy deceases. And if transaction fees increase to compensate and people transact less the whole thing blows up.
If 10% of the current facebook users want to get on lightning and we can make 6 transactions per second it will take 17 months before all are on board - and this is assuming no other types of transactions (so any payment made with BTC will delay this)
Given we're currently floating around 10-15% fee-supported at the moment, I'd say most people are optimistic that we will succeed in moving Bitcoin into its final economic phase (i.e. in 10 years it will be 50% fees).
Personally, I still consider it a risk.
It is game theory: If you really want your transaction to be on-chain, you pay for it. And smaller blocks means less transactions will fit in one block. So fees will need to go up.