I don't see the harm in trying, providing we have someone at RB filling in who can actually defend.
Roy obviously doesn't like his defenders playing football, which is why Agger isn't getting a look in, so Johnson probably has the shackles on too. There's less (but not necessarily no) responsibility up on the wing so we wouldn't have to worry about his defensive flaws so he can concentrate on ripping the arse out of players while up there.
The only drawback I can think of is that he has the space to run at players from full-back, whereas if he is up on the wing then the full-backs will be on to him like a hawk. Another pro for Rafa's attacking style, that everyone else seemed to overlook, over Hodgson's sit back and soak approach I suppose.
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