AlexGR, do you allow for the possibility that maybe small blocks isn't a good idea?
Timing is crucial.
Even 1TB per year blocks (20mb/block) will have its time when 20mb/block will be "alright".
Upgrade too soon, you'll have 10gb txs and 990gb spam.
Upgrade on time, you'll get 800-950gb txs and 50-200gb spam.
I don't understand why it's spam when it pays a fee. Miners are free to exclude tx if the fee is too small.