What purpose would that serve? I don't think Booth had that much clout and his conspirators were not all the sharpests tools in the shed, so do we really think they could pull that off?
Again, you have to wonder to what would be gained by faking his death, letting him go, whatever.
I think scout nails it... he was recognizable, lingered a bit after being shot, and would have easily been identified.
Nah, JWB died that day in April 1865.