That's the thing, RDM doesn't need anything to be able to "melee in end game", they already can. It's simply looking at the problem from a different point of view. There is currently nothing keeping a RDM from meleeing other then community pressure and cognitive dissonance.
http://en.wikipedia.org/wiki/Cognitive_dissonance
It's a really good term / theory to describe the current state of RDM in FFXI. There are many people who absolutely believe a RDM should never pick up a sword and lolMeleeRDM. No amount of explanation, demonstration or evidence to the contrary will change their beliefs. It's because if they did stop and actually see where we're coming from their preconceived notions would go way and they'd be faced with the very real truth that they were wrong. This is an extremely uncomfortable feeling and attacks the ego, thus subconsciously their mind rejects the idea out of hand in order to protect the ego.
I've demonstrated how to do it years ago, practically wrote books on the subject. Everything from gear setups to potential sub combos for different situations, and even situations where you should not melee at all. The situations are not "end game" but rather in any situation where your available time is taxed to the limit and thus there simply isn't enough time to melee. When your cure bombing people and spamming -na magic / erase (/SCH) / dispel / with the occasional Haste / Refresh, AND running around to take care of business, then it would most likely not be wise to melee. Basically if your stuck playing a mini WHM, then it would be prudent to keep the staff on and do mage work, your keeping people alive. But if your not playing mini WHM, there is very little reason to NOT melee, they make echo's for a reason.