Here is a real newbie question. If the current 1Mb blocks are underutilised, is there any evidence that doubling them to 2Mb will make any difference at all?
Dear Curious,
Your question is somewhat ambiguous.
If you're asking about higher block size limit causing the miners to better utilize block space, there's no evidence..
If, OTOH, you're asking whether allowing bigger bollocks would allow more transactions to be packed into a block, the answer is "obviously."