Well, I thought about this a lot and have adopted this approach a few months back now...
Found an interesting few articles on the subject and this one stuck out in particular, as I'm really just a casual hobbyist with my photography I thought I'd give it a go.
http://erickimphotography.com/blog/2...-and-one-lens/
I have the kit lense that came with my camera and have not even used it once yet. Sticking with my Zeiss 55 f1.8
And Sony A7 I plan on sticking with it for as long as I can to 'make' me learn how to shoot with a fixed focal length.
Any one else tried anything like this, how did you find it?