why do you ask question to already answered problem?

Again:

bitcoin itself will show us with first destructive halving occurrence - what is the lowest possible level of emission to preserve already reached network security level

the stopping before a cliff (or: spiral of death) is one time process - we can remove (destructive) halvings or not

breakthrough in ASIC technology changes nothing (like every breakthrough from CPU -> GPU -> FPGA -> ASIC - didn't interfere with emission)