A couple of weeks ago GC shot it down as unfeasible, wow gold for sell and I agree. It's not as simple as say, multiplying all the mob's HP by X%and their damage by Y%. You'd have to completely rebalance the boss's abilities based around current max level abilities and mechanics. Just as an example, a lot of old bosses were designed around dispels not having a cooldown, which would be murderous with today's 8 second cooldown. Sure you could correct this, but by the time you accounted for allt he differences it just becomes not worth the effort. You might as well just make new content.
There is a reason "never say never" has become the only reliable "rule" associated with Warcraft.
They rebalance and retune things constantly, where to buy wow accounts and what you've described is nothing but another example of this.
The only thing one can say for certain is that Flex Raiding is being released as a test and one can only play wait-and-see to find out where it goes from this PTR description and announcement ...
Anyone ever been trolled so well in game that afterwards you couldn't help but laugh?
ex: The other night i was trying to grt into a Throne of Thunder PUG. After 10 mins of spamming trade, i get an invite. I didn't really look at where the summon was for, just clicked accept. I end up in the Arena in the Cape of Stranglethorn, surrounded by twenty Alliance. Needless to say, I quickly went down. It was a pretty spectacular troll.