you say 1mb blocks aren't filled atm - correct. So there is obviously no need to scale up yet
as i said before an hard fork needs to be planned a long time ahead. if there is a need it is already too late by 6months (minimum)
edit: i cant imagine transactions more micro than faucets - and even they work with 1mb...
so where are those microtransactions coming from? btc gots more adoption by fee paying participants? GREAT!
if they would just spam no miner would include their transactions