Much more important, it seems to me, is what they're going to call it when they need a level above titanium? Sort of like ATC, -- widebodies are "heavy"; 380s are "super." What will they call it when someone builds an exponentially larger plane? (Yes, I'm intentionally ignoring the fact that market conditions wouldn't support a plane generationally larger than the 380.) "Giganto"? Nah, too many syllables and it doesn't roll off the tongue smoothly. IIRC Concorde had no such special designation in ATC communications.
And why titanium? It's much less costly than platinum. In fact, titanium is often used as a substitute for platinum in rings because it looks more or less the same and is so much easier on the wallet.