Honestly, most of the time it's not the OEM that causes stagnant pricing on older products... It's the seller. It's also not just Intel. I could go find obsolete but brand new first generation 120 GB SSDs being sold for thousands of dollars to this day.
Those sellers have no way to off-load obsolete stock. They just sit there, collecting dust. They refuse to lower the price to move the product since the storage space isn't really a problem for the likes of sellers Amazon, NewEgg, and CDW. They just keep it at or around MSRP.
New car dealers (not used) have a different concept. Excess year end models are shipped back to the car maker for a rebate to the dealer since they can't sell them. They obviously make more from an actual sale, but returning them to the car maker incentivizes them to clear the limited lot space and allows the car maker to recycle the materials into new vehicles or ship them to a "like new" dealership selling old model cars for cheaper prices.
Wish electronics sellers would do that, honestly.