I've actually tried this idea once before, and players reported feeling more connected to the plot. The RP eventually fell apart due to player dropouts (which, in this style of RP, is particularly harmful to the game) and lack of consistent posting. So if this is going to work, we'll need 1) the GMs prepared to take over characters when their players drop out, and 2) a regular, rapid posting rate. I recommend daily or every-other-day posting rate requirements, since any longer may make people drop out due to frustration and loss of interest.