Board Thread:Roblox help and discussion/@comment-33888574-20190816130331/@comment-34722333-20190818194427

I'm not sure what will happen to lifetime members, it's a tricky one to solve here. You have to sort of realize that not many users have a registered lifetime membership for Builders Club and so the minority will only be present to speak out if Premium causes them to lose it.

My take on this is Roblox will either give these people lifetime premium through consecutive monthly Robux allowances infinitely, or directly switch their membership to the highest tier of premium (Roblox Premium 2200) without question.

These are just predictions, so don't take my word for it. Premium is not fully shipped out yet so it'd be hard to tell.