Why would Apple lose market share, when they can't make those things fast enough? I'll come back to this study in 2015 to laugh at it.
Because the goalpost is changing.
There are cheap phones, there are medium priced phones, there are expensive phones. iPhones are all in the category "expensive phones". And Apple cares about their share in "expensive phones". They don't care about their share in smartphones.
Smartphones used to be expensive phones. Now more and more cheaper phones are smartphones. So Apple will lose marketshare in the "smartphones" category because in 2015 that category will include an awful lot of cheap phones, bought by people who are not at all interested in a smartphone, but only in a phone that is cheap, lets them make phone calls, and if it looks nice that doesn't hurt. Apple's marketshare in "expensive phones" will likely go up.
It's like in 2009, 2010 Apple's marketshare in laptops increased less than it could have because all the netbooks that are really just toys but were counted as laptops, artificially increasing the number in the category "laptop" by adding products that Apple didn't even try to compete with. Now the iPad apparently stopped the growth in netbook market completely, so growth in laptops is much less than it should be, so Apple's market share there is growing beyond the growth in laptop sales.