The role of Heirloom items in future content.

So we all know Heirloom items are quite useful for leveling alts.

But do you think Blizzard will remove the Experience bonus in future (leveling) content --> Next expansion?

I can imagine level 80 players with the Heirloom shoulders, chest and 2 x trinket that gives you 4 % mana or health back every time you kill a mob being kind of overpowered on leveling speed.

Or do you think they will leave the items untouched?