Proposal! Making High level dungeons challenging for level 60

With 3.1 coming up with new content, we are loosing interest in older content. I know the experience boost in the level 50 dungeons and that is great! I have an idea with that to keep the dungeons up to date so they are not tossed on the way side and slowly forgotten.

It would be nice to just copy and paste the high level dungeons and just change the stat numbers on the enemies to be equal to level 60. if all the dungeons are around ilvl180-200 challenge rating, it would help call out mid tier players. Simply keeping the loot list the same for glamour or changing the armor to craft items for level 60 crafting gear would make me and plenty others happy.

It wouldn't take much other than changing numbers. would it?

I feel something like a tight ilevel sync would be more effective, since whatever numerical values the dungeons would be given to challenge a level 60 character will slowly but surely be outgeared once again. Syncing players to the minimum (or perhaps even lower than minimum to compensate for having skills up to level 60?) ilevel for an instance would help keep its charm and challenge intact.

Properly incentivizing such dungeons would help, something like a long term, cumulative glamour or mount grind, maybe toss in a title or two or a minion, something that will make players want to have another go, rather than trying it for the novelty of something different, then shelving it along with all the other old content. Regardless of how exactly it's implemented, I would enjoy having a reason to re-visit the level 50 dungeons, and having things fight back instead of just melting beneath our feet would be a welcome change.