With a little planning, single drivers can move freight nearly as fast as a team. I'm a solo O/O linehaul contractor, and while I do a lot of freight out of a breakbulk terminal to an end-of-line terminal, I also move a lot of freight that is going on. For example, the two trailers I brought out of Louisville Friday night and dropped in Memphis are both going on west, as is, with no break-out.
In fact, I can make the trip from Dallas to El Paso in one shift, take a break, and come back. If trailers are going on, it's no big deal to take them into the terminal and have another driver take them on.
But who knows for sure what will develop?