Yup, still much discussion about that this past weekend, but a TON of money (100mil for the roof) and would take away from the experience similar to BC Place, Big O or Skydome Etc.
The existing is fantastic as is.
*it was designed to support a retractable roof should future needs/desires require it.
What are the chances of Commonwealth having upgrades/being replaced now that FIFA isn't coming to town? I'd imagine Commonwealth needs rehabilitation either way at some point, no?