I mean I think it's obvious that to have a system like this they have to add weapons at a fairly high rate - basically we need as many weapons to come in every year as we did from the beginning to end of Forsaken to keep things going correctly. If they do that, then I don't think it'll be a problem. I also don't think they need a 2 of each archetype in each slot. There are two kinetic 150s, but Spare Rations is currently the superior one anyway. There are multiple energy 140s, but if you have one, there's no need to ever really farm the others (I had been using the same Outlaw / Dragonfly Nation of Beasts for a year because there wasn't anything that really replaced it anyway). As long as the weapon has interesting rolls people want to farm, then there's no risk of it being any more stale than it already is.

And I do think we have pretty easily target farmed weapons now, if Vex Offensive and the Obelisks are any indication. I mean I'm not looking at this with total rose tinted glasses. It will require effort on Bungie's part. But this is something other game studios do, especially long term MMOs, and it works pretty well in them.

As far as why we can't have new 150s or anything like that, that's just the limitation of development. Every studio's different, but as it currently stands, how many new 450 autos can they make that feel unique and different from the past ones? Hand cannons are an even more extreme situation. Eventually we run out of space for unique weapon combos. Phasing them out after a year is something we were all pretty fine with in D1, so I don't think it'll ruin the game somehow now that they're no longer doing this thing that they only really started a year and a half ago.