I agree that he should've been given more chances and would've loved to have seen him play more test matches but according to this article, part of that was a personal choice as he wanted to focus more on the shorter formats of the game. A bit odd because he initially dreamt of playing test cricket but in the end it didn't work out like that:
England’s one-day captain tells Andy Bull he is happy to specialise in the limited-overs game but feels there must be a shift or the divide between the formats will become bigger
www.theguardian.com