I know the bf seriously dislikes the idea of 2x10 gearing for mtb. In his opinion, it's moving that way because that's what companies are making, and not b/c that's what people really want. But I'm sure it depends on where you're riding (and who you ask - but he's been riding for eons, so it's not like he's not in bike shape).

Personally, I wanted to go 1x9 before I got hurt and lost most of my leg strength. I was spending the majority of every ride in the same 2-3 gears. But...now I'm very happy with a triple