This desribed kind of attack is very niche and hard to see in the wild, overall imo sub 1s/vb is a positive thing for the majority of people, and precisely because of that likely there will be much more txs onchain, but it will always be low because of LN , so 1000/vb may never come. Then there's CISA that may change things a lot again. 

88b0c423eb

When someone sends you dust outputs, you can simply choose not to spend those outputs specifically, especially if they cost more than they are worth.

Murch

ideasfromtheedge

Sub 1s/vb transactions

Sub 1sat tx are not good but there is nearly no way of not allowing it. Because the miners decide what comes into next block, not the noderunners. And they will mine everything if the block has space left.

But i think it can be a attack vector. 
What if some bad entity with a few btc spams your address with very cheap dust tx?
You realize it later when you want to spend onchain and you move these utxo. When we are back at 100sat or 1000sat/vbyte these people will lose a big amount to miners.