I agree, the next couple years sounds about right, I'm thinking that three is fair between development & adoption. I'd love for it to be sooner, but I'm also not ready financially & I'm really selfish & would like to find a way to invest before it's too late.
With the personal optimistic evaluations of Bitcoins growth potential, I'd really have to be feeling an ICO to part with the tiny amount I have. If I could easily throw Fiat around I'd be all over a few of them though.
We're sure entering interesting times, love it.