Here's my idea about making a lot of raids relevant again while introducing an endgame that would hopefully not be crazy difficult to implement.
I don't want to see almost all of the epic sands items, almost all of the epic VON items, and the rest of outdated epic items get updated. There are just too many of them, we have enough gear to deal with as is, and the power creep needs to be slowed, not accelerated.
For these reasons, a system in which newly acquired epic gear from older raids could be turned into unique augments or turned into augment slots on existing gear seems optimal. Think of it as pulling the magical properties from the gear and combining it into other gear, although it wouldn't make much sense to take the actual abilities from the specific gear (for the most part). Each raid could offer a unique set of augments and augmenting options (through the named gear) in order to encourage people to run them all. For example, LOB could offer an item that could be broken down to obtain a Ruby of Stunning X, while a particular epic Sands item might be able to be drained in order to add a red slot to an existing item.
This would eliminate the need to update a ton of gear, it would make gearing characters easier and hopefully open up some gear slots, and the raid gear would not need to be updated again in a couple years (unlike if the items are updated) so long as the unique augments and augment adding abilities weren't made available elsewhere.
The other thing that would need to go along with this, is updating the old raid difficulties and adding epic options to raids that currently don't have them. This is key.
What are your ideas for making the old raids relevant again, forumites?