I have been a huge fan of destiny, and I owned both, and loved both. I personally believe that the vex and necrochasm should be back, but maybe do something to change them. Vex seems to always run out of ammo fast, so maybe make the fusion rifle ammo increase affect the vex more, or just increase its base ammo reserve. As for necrochasm, it's fine as it is.
Update: I'm amazed, there are so many people who want to have the raids and their guns back, thanks for all the support, and hopefully bungie will notice this.
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I think they've done an amazing job with Out Break Prime and how it's amazing for PvE and just a solid PVP weapon ((not OP)). They should introduce a quest for Necro and Vex and fix them a little. Y3 SIVA Vex Mytho "increase the range and reserve ammo still have Solar elem) Y3 Taken Necrochasm "add counter balance as a hidden perk and change it's element to [b]void[/b]" Vex and Necro have elemental burn so that give them an edge in PvE and they will basically preform normally in PvP. This way you can have all primary burn (vex=solar Necro=void zalos=arc) but they are exotic choose wisely.