brandon black/reardencode, a bitcoin engineer I've got to talk to a lot recently and have been impressed by his depth of knowledge...

shared and interesting fact about tx propagation that I didn't realize on the "filters (modulo 0 fee relay) are basically retarded" panel in portland:

even if you have 99.999% of nodes with filters, just due to the way tx's broadcasts are retried in bitcoin and how likeminded nodes find each other, transactions will almost always find its way to a block regardless of the number of nodes filtering it.

they even found a case where libre relay (a node for very liberal filters) was blocking a tx, and yet it still went through. you can sum this up as "the weirdos will find each other".

0 fee filters are still useful for regular node operation, but it won't stop consensus tx's in the p2p network, even if there are very few nodes with no filters.