That's how progression works. Out with the old, in with the new. When you resist you're showing you a) don't understand the concept of progression and b) are unwilling to move forward because of unhealthy attachments/nostalgia. Which is no different from the nonsense I saw on the FFXI boards when the developers wanted to move content in a certain direction and the people with relics/mythics/empyreans started crying that their time spent and the gear that came from it wasn't cream-of-the-crop uber elite. Which by extension is also no different from the WoW players in Naxx gear who complained that their gear wasn't going to matter once The Burning Crusade hit.
I said this because when your main intent is making old stuff relevant in the same scale as new stuff, you're either making concessions in gear design, content design or character growth. I'm not about to sacrifice any of those just because someone is upset their breastplate from final coil will become obsolete.Also, content progression is NOT "snuffed" in any way.
For the record, I've done more gear grinds than I can count. The only thing that ever bothered me about disposing of old gear was that I liked the design of some, especially as looks varied depending on the tier/gear level. Lo' and behold, systems like wardrobe, transmogrification and glamours come into existence and pretty much do away with the only problem I ever had with sharding/tossing/selling outdated gear. Gear is tangible, yes, but like everything else there will come a time when it has to be replaced. That's why I'll cling more to my memories raiding or the odd weapon/gear that makes sense for my character's concept (my gnome's favorite weapon in WoW was an axe I got while questing in deepholm, nothing from any raid) over the current top gear.