I think you stated it perfectly. The only difference is: with the new raid, some people aren't even trying it get the old loot. Obviously, it's up to that person what they end up doing, but the Vault of Glass was my favorite experience with Destiny. I was finishing up Crota the other day, and I asked if anyone wanted to do the Vault. Two of them responded, "is it hard?" This killed me. The new raid is fun, don't get me wrong, but nothing compares to the first time atheon teleports you. I feel that if there was some way to upgrade guns past 300 (kind of like exotics with xur, or even the crux of crota with necrochasm) it would boost the incentive for newcomers to play the new raid. As for myself, I don't see myself letting go of VoC or Fate bringer anytime soon, and I would love it if they could be upgraded.