this seems interesting, i was thinking about why not miners couldnt set their own limits and let that be the solution.
i know that big minners could make huge blocks to try to drive small miners out of business, well is true but im sure that core guys can solved it in any way.
That is what a lot of people demanding 20MB blocks don't get. The miners get to choose which transactions are accepted on the block. I pay a VERY reasonable fee that is higher then all their stupid pointless transactions and I get accepted into the very next block! Imagine that? But wait...
Whoever is doing this is actually trying to push us into deciding. This isn't really a bad thing, but manipulating isn't that good.
These transactions are spam, and aren't natural. You can make your transactions have higher priority by including a higher fee. Until the blocks are naturally filled, we should be fine.
According to Luke:
Ironically, they're demonstrating exactly the opposite: that a limit is absolutely necessary.
However I don't agree with this. As previously stated, it would not make much sense to send $2 while including a $1 fee.
There was also this experiment recently:
https://bitcointalk.org/index.php?topic=1075590