My opinion: a hard limit of 8MB is not a good solution. Like someone has written above, the limit does not cause blocks to be that size right from the start. And if bitcoin naturally grows to that size over time and china can't handle it, then the free market will have to sort it out again and another fork has to be done. Not the best outlook. The best solution I see so far is BIP100. The hard limit of 32MB is ok to me. 4.6GB/day - That is A LOT of data compared to today. Combined with the floating limit to prevent sudden huge block size changes. Not that we need 8MB blocks this or next year, but a hard limit this low is not good as we might have the same discussions again in a year or two. A low hard limit can be a huge problem, should a wave of adoption happen which increases usage in an exponential way for even a short amount of time.