A larger blocksize will make a spam attack more expensive, no?
Bingo... a 2MB block is significantly more expensive to fill. Lets assume the average block size is about ~.2/3 filled a spammer only has to fill ~1/3MB. If the block is 2MB that requires 4x the money. Does it stop it no...but it makes it alot harder.
this assuming that the block will not be filled completely in the future, basically they are waiting for the right time to have the hard fork for 2mb
for the right time i mean when in theory the 2mb increase is full already when adopted...this will only lead to an endless cycle where we always need an increase....