For what purpose is the bigger block? Why is there a need for a 1 megabyte block, the blockchain works fine like now?
Blocks only get big when there are many transaction in them, so how could a miner create a bigger block without that much transactions
Here's a Q&A with Gavin and Mike, at some point they discuss the bigger block issue if you're interested.
CoinScrum: QA with Gavin Andresen and Mike Hearn
https://www.youtube.com/watch?v=RIafZXRDH7w