With a few overseas trips coming up, I've been considering a small, low weight, quality camera system to take with me. And, I'm also thinking that such a camera would also be useful for general family photos. Micro four thirds seems the likely option as I don't like being restricted to the one lens of the x-100. How I wish Canon would enter the market with a small, mirrorless, APS-C based camera with a new range of fixed pancake lenses, but with the added ability to autofocus quickly with EF lenses with an adapter.
After doing a bit of reading over the last few weeks, I don't think that "mirrorless" could be considered niche. Instead, as the quality, responsiveness and range increases, I think more and more first time purchasers will prefer this option over entry level DSLRs.
My long range prediction - in five years time, there will be no DSLRs below the 7D equivalent. This is because the only reason to buy a DSLR will be better weather sealing in a tougher body, real-time viewfinder, more computing power, faster autofocus, use of EF lenses without an adapter, better battery life, FF sensor. But, for people that just want a camera with better picture quality than a P & S, most of the DSLR advantages are irrelevent and I'd be willing to bet they will choose a mirrorless option (and hopefully a Canon one).