I have been running a full node for little less than a year and I am following the discussion around blocksize increase. I am for it.

Who actually can make a decision whether the blocksize increase gets committed to the bt core? Is a majority vote from core devs required? Obviously Gavin Andersen, an outspoken core developer is trying to convince someone with his blog posts. Whom? 

Also how can the public coordinate their desire for blocksize increase? Everyone posting in their blogs is not going to cut it, or?