The Blocks are not to large, it is too small. The capacity of these blocks are running at 80% of it's full capacity at this moment and at 100% when there is a spam attack. < percentages are on average > So we only have problems, when the network is spammed with fake transactions.
These attacks can still happen with larger blocks, but it will just be more expensive for these idiots. ^grrrrrrr^
hmm,
Also don't know how it would be a year later.