I just checked and the current XT & XTR 3x11 systems use the 11-40 cassette and 40-30-22 rings. This is pretty obviously targeted at 29ers which will wind up with a 16" bottom and 105" top gear. Could be moved up for smaller or smoother wheels and tires with a different crankset. You can do a lot with 47-link wrap, wow!

In my own reality of commuting, I could get by with a 35-70 range. I'd like 30-100. In my own MTB riding I pretty rarely get off the granny ring. I think in either case I could use a 1x system and be happy, but my ring would be smaller than what most people are suggesting, just because I'm not so fast a rider.