Well, If it worked out like Primal Rend (Which was i think the only worthwhile Elemental WS ever, although its not much of a shiner today), I could see it being useful.
I don't think we'll be seeing new Weaponskills however... Although, If they just gave RDM sanguine blade Naturally it could be have some decent uses.
Realistically however, if with your best buffs/WS gear, It would still be painfully weak compared to what other DD can do. But if stacked with strong supportive buffs like the ones i listed above, stronger Enspell damage, etc... It could level the playing field a bit.
really though... Its probably doubtful RDM will get anything Melee related mostly due to how the general community would react. I think its too late in RDMs game for SE to consider adjustments like this. Even if they did come out and boost RDM melee proficiency, people would complain they didnt get a "Real update". (Cause lets face it, people are whiners. So am i though, FU Collaborater range improvement).
Thats the biggest problem to solve it seems..