The table is nice (didn't really check the numbers though), but I think it fails to consider the ways in which different ideas can be combined. Some ideas work very well with others.

I'll comment on my own position:

• I haven't yet examined Greg's proposal in detail, but originally my main concern with it revolved around implementation difficulty, and the magnitude of change in the spirit of Bitcoin. If those are out of the way... Then it might turn out that mathematically and economically, it's actually equivalent or even superior. We do need to carefully consider how this proposal changes the difficulty.
• An elastic cap should be combined, IMO, with an increase in the block limit. T=3MB would work well for now. Without the soft cap, the block limit should go up to something like 4MB.
• I still find it hard to believe that Side chains are actually possible (recent news about first sidechain being rolled out notwithstanding). But assuming they are, they're a game changer. They would pretty much take the edge off the entire debate since everyone can just choose a chain to their liking. Assuming someone implements it, of course, but that should be easier when people can spend less of their time arguing and more developing.
• Micropayment-channel based payment networks are a critical component of long-term scalability, but they're not a replacement, and still need more time to be viable.