I disagree with the " making new raid weapons less important". I think people will always want new weapons and try to get them. Especially if they have good perks but it would be pretty nice if we could upgrade or favorite weapons until we get some of the newer weapons. I do think your idea of getting a random drop of something like the "core of Atheon" would be the best thing to do and then take it to xur or the gunsmith and pay like 5k to upgrade but I think it would be best to go up to 331. The only problem I could see is ppl complaining about not being able to upgrade the vex mythoclast.