My reason for recommending a Canon DSLR is that the DSLR is still by far the most versatile camera you can buy as long as you're not wanting something you can put in your pocket - which I don't think the OP is necessarily requesting.The X100S has a leaf shutter, a flash that adds perfect fill, a built-in ND filter, much cleaner shadows than my 5D3, optical viewfinder + EVF, etc. It's very versatile, and in ways that my Canon DSLRs cannot match. It's not just about size, but it beats my DSLRs in that area too. Both are great, but for different reasons.
What do you think of the x100s' AF, quod? Do you think it's fast enough for chasing a toddler around the house? (I'm not considering true action shots; for that I'll stick with my DSLR.)