You can balance specific weapons without leaving [i]entire eras[/i] of gear behind.
And they're already balancing things pretty seriously in 2.0, so it would be pretty strange if they go through all the trouble of nerfing gear that is already going to be left behind... So I'm still hopefull that our gear will have a way to stay current, at some point.
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Bungie probably just wants people to use their new weapons in stead of their first set of weapons for 10 years. You'll still be able to use them in crucible and the old raids. For newer higher level content you'll need newer higher level weapons. Sound logical to me. Something better than the weapons we have now is bound to show up. The old weapons will be nice memories of the first year.