Consider for a moment the quote that the person or persons known as Satoshi put into the genesis block; many people feel that bitcoin is not broken and not in any danger from the current block size, and do not favor having a process - any process - wherein sufficiently agitated groups can change the basic rules of the game should they garner enough popular support.

This is the "if it ain't broke" crowd. It comprises the majority of early bitcoiners. The notable exceptions are the large, VC-funded businesses that have a specific vested interest in bitcoin being used for widespread retail transactions, a task it is horrendously suited for, even with any arbitrary block size.