Yea, but the main advantage of the system over air-travel is that it's fast. For most types of cargo, cost rather then speed is the main issue, especially if the difference is just on the scale of a few hours.
When shipping internationally if cost rather than speed is the concern you ship by boat. Shipping by rocket over a plane would just be another higher tier of service. If Musk's pricing is to be believed it would make shipping between continents potentially faster than shipping within the continent. That would change the industry.