In 3.0, is Level 51 ItemLevel 60? Or is Level 51 ItemLevel 150?

[Rufalus]

I expect it is the first, because the second would break everything

Game already works that way. Old stuff that people worked hard to get is overshadowed all the time. They could make the new AF2 sets from job quests be i150 and it would be ok. Old content would still level sync down to 110. Old 90-130 gear would become much easier to get, and be treated as non-essential glamor sets you can ignore and level right past.