I might change to whom #2 is directed. IMHO, the naysyaers come in two categories:
1. The true Eeyores who think nothing works, there is no hope, we're all doomed, and all around masochists who I suspect aren't someone to depend on. For anything.
2. The operatives/Leftists, who try to discourage peoole from taking action. These are the true scumbags of humanity. Unlike the first category, they are the parasites who like a leech or mosquito, try to numb their prospective host to avoid getting swatted/squashed. Their biggest fear is that taking action COULD work.
Advice to should be to IGNORE the naysayers (because their intent is to hinder any effort) while following the second part of #2 of your post.
NY City probably has closer to a 3 day supply of fresh food than two weeks. Computers have made just in time delivery a real thing and real estate prices have made storage a real issue for smaller businesses. I do not know if this thing will catch on, but it would not take long for the impact to be felt if even 15-20% of truckers got involved. A better strategy than a full boycott would be to just Botox things up with no Monday Friday deliveries. You might get more truckers involved if they did not have to cut their own noses off.