As you know I'm trying to lobby for a block size increase to a static 8MB.
I'm happy to try to get the testing done that people want done for this, but I think the real crux of this issue is that we need to get consensus that we intend to continually push the block size upward as bounded only by technology.
Imagine an engineer (Gavin) at Boeing (Bitcoin Core) said he was going to build an airplane (block) that was going to move 8x as many people (transactions) as today’s planes (blocks), all while costing about the same amount to operate. Imagine he then went on to tell you that he expects to double the plane’s (block's) capacity every two years!
Without full planes (blocks), will the airlines (miners) go out of business, since planes (blocks) will never be full and the cost to add people (transactions) to a plane (block) will approach zero? Probably not. Airlines (miners) still have to pay for pilots, security screening staff, fuel, etc (engineers, hash rate, electricity, etc) so even if their airplanes (blocks) can hold limitless people (transactions), they would still have to charge sufficient fees to stay in business.
What tests do you need done to move to 8MB? Pitch in and help get those tests done; agree that we'll run more tests next year or the year after when technology might allow for 16 MB blocks. Do you really want to be the guy holding back bigger planes? Do you really want to artificially constrain block size below what technology allows?
In the face of such strong market demand for increased capacity in globally aware global consensus, do you really think you can prevent supply from meeting demand when the technology exists to deliver it? Do you really want to force a fork because you and others won't agree to a simple raise to a static 8MB?
Do what's best for Bitcoin and define what needs to get done to agree to a simple block size increase to a static 8MB.