You've had these weapons for a while year, you've spent your time with them now go get the new gear. This is the problem and bungie wants it fixed, players are way to attached to their old weapons and won't pay attention to the new ones so leaving old for new is the better idea. It's like leaving last gen behind for new gen, just keep your gear and in year 5 you'll have all year 1 gear and can show it off in the tower and use it in the crucible and show the later generation of players just how good year one really was. Besides your gear isn't great in PvE, but still will be in pvp