Enough that it's above the threshold most miners have set for their mempool yeah. 1sat/byte is enough for now but it'll be a moving target as activity ramps up.
The only way that it will become a arms race is if the blocks starts to get filled, and the plan is to raise the block size if and when that happens.
Right! The way to make 0-conf safe is raise the block size! Miners automatically find the fastest way to propagate txns because they're keeping an eagle eye out for incoming blocks.
