Aside from market share gains in NA and UK, I also feel they will make headway in South America as well. For some reason I read in another topic that Xbox games cost less then PS games in certain countries there.
Otherwise I feel as the years go on only doing console marketshare won’t show the full picture. Especially if Xcloud really takes off with IOS and Android devices and those rumors of a Chromecast-like stick that allows to steam off the TV. Just something to ponder as the gen goes on. Really uncertain times ahead.