Ha ha, yes, declining from over 50% of one of the largest markets on Earth to just over a third...the fact that is declining isn't a factor - the fact that so many of them jailbreak is.
They sold 2m iPhone 5 in the first weekend they went on sale in China. Imagine how many more they'd have sold since, to those who won't upgrade because they can't jailbreak.
It is a factor if you understand why people were jailbreaking. The need to jailbreak has been removed therefore less people are worried about it.
Those who still want to jailbreak won't upgrade, that applies to every market where the iPhone is sold and yet it the IP5 still selling well and most analysts expect the sales figures to be positive.
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