yup, thats actually good investment advice, better get in early if you can.Time to buy stocks in aluminum mining and manufacturing!
Actually Aluminum is a very common element, it's just hard to separate it from the hydroxide ions.
Will prices go up, yes, but it will be for more manufacturing plants, after-which the price would stabilize when capacity and demand equalize. In the course of time, I believe that pricing will remain reasonable.
A little American trivia...
A History of the Aluminum Cap of the Washington Monument