No one has a clue what the future holds.

Those that tell you otherwise are selling something

Linton Wells (wiki link) is an expert in national security and served in a number of different roles in the White House under both Bill Clinton and George W. Bush.

As the Deputy Assistant Secretary of Defense to President Bush, Wells published a memo titled “Thoughts for the 2001 Quadrennial Defense Review.”

Note: I actually found the document.