If you wanna play this game I can: it will effectively retire a number of nodes from the network.
What are you basing the statement on? We currently have a 1MB cap, yet we do not have 1MB blocks. Raising the cap has no causative effect on the block size - it will only go up when the volume of transactions increase enough. Speaking as one full node operator, I can say that the incremental cost is entirely trivial, and my node will remain.
It is a slippery road opening the door for more unadvised decision encouraged by populist movements.
I asked only about a change to 8MB. Further changes would have to be approved on their own merits.
The effects on securty and the network are unknown and have yet to receive any legitimate testing.
Actually, it's well tested. When I first started using Bitcoin, it had no cap (or actually had a 32MB cap due to code limitations).