I think raising the weapon damage and maybe lowering the drop rate for some of the "classics" from VoG would actually help keep the playtime longer for new players. Imagine starting to play Destiny at DLC 3 or 4. Will you ever run VoG? Probably not, there is no incentive if new raid gear is always better. But what if a few VoC weapons (vex, fate, VoC) leveled up with each expansion and they were contenders for the best guns in the game. Now a fresh player will spend time in VoG to get them. Maybe there are 2-3 guns in every raid that get bumped up in stats at each DLC. It would reward the Day 1 crew who have The good weapons. They keep their trusted friends. And it would allow for new players to grind through all of the raids to "make their marks".