Not convinced about Metro
Modern tablets are way more portable and light. I visited relatives over the last week and was pleasantly surprised to find a whole new generation of Uncles and Aunties in their 80s using iOS and Android devices. All laughing and talking while merrily holding their tablets in one hand and then stopping and talking to some other relative with Skype in some other country. Great fun to watch. The big difference is not having to have a keyboard and their lightweight. Convertible tablets are way too heavy. They need to be less than a pound and a half (750g). Assuming everything else equal, then MS are onto a winner.
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