To use a 4-3-3 properly, we'd need wing backs not a couple of 30-something full backs. You know, the type of athletic player capable of charging down those really wide area's that we have at TCS then when the attack breaks down, he should be able to get back to defend in no time at all. Otherwise we'd be totally defenseless on the wings. Opposition wingers could get as far as the final third, virtually unopposed. Bad times.
In short, we will not see a proper 4-3-3 (the way we'd all imagine it) any time soon. Unless it's against us.
I say we stop this nonsense of playing Imrie up front, get him on the left wing, get Hayes on the right have McBain in the middle, and Sanchez playing slightly behind Foran and Rooney/Barrowman (until Odhiambo comes back).