I have up to this point avoided buying the X100, rationalizing my choice with the need for a big firmware update as well as my reluctance to give up the multiple lens flexibility that my EPL1 offers. Having just returned from 11 days in Paris where I shot just over 1000 pics lol, I just realized that I never removed my 20mm 1.7 the entire trip. I never once said to myself "I need to go in my bag for another lens". Now I'm thinking perhaps I have over rated the necessity (or my desire) for multiple lenses. Hmmmmm..... certainly gives me food for thought, especially if this firmware update is a great one.
Sounds almost exactly like me kev! E-pl1 + 20/1.7 for me before I made the jump to the X100.
Whilst I can guarantee you won't have problems getting used to the setup, I can't say you won't be back to m43... Case in point, my x100 is up for sale and I have a new g3 on order (i kept my 20/1.7, guess I knew this would happen...)