I think if you played 2.0 pretty hard core and have gotten some 120/130 ilvl gear it should be used to make your levelling process easier. Although you will have players complaining that every drop in levelling dungeons is useless. Plus 5 years down the track new 50 players will be ilvl 50 or so going into level 51 quests. They cant be expected to grind out 5 year old content to be able to start to level to 60.

And while mentioning wow there the ilvl climb has been way way way higher in FF. We're effectively wearing end game burning crusade gear in vanilla.