Not necessarily. Taylor could convert random dirt into nanomaterial and use that to rebuild the port infrastructure. In a matter of days, even.
Hummmm... I'm not 100% sure, but from what I've read in the manga and seen in the anime, nanomaterials are a scarce commodity and hard to manufacture. Otherwise Hyuuga could have rebuilt her hull instead of turning what was left of her into a makeshift fortification.
Shipping will come, then. Not much, but some, because there's some demand for goods in a newly opened port city.
I forgot to address the post you are quoting, and you are partially right. Some goods possibly will be delivered directly to Brockton Bay, as they are for local consumption, if it's
cheaper to do it directly instead of, for example, such goods being unloaded in Boston and transported by truck or train to BB.
Similarly, companies will resume their trading routes with BB if,
and only if, the port has the infrastructure to handle the cargo, and it's more economical for them to do so.
So, if for example, delivering the goods in BB instead of Boston reduces the time by one day, the affected companies will go back to BB in a heartbeat, because one less day means one day less of wear and tear in the ship, less fuel, less crew salaries and food, and of course, it means the goods are delivered one day earlier.
There is still a lot to be done so the port can get fully active, like refurbishing the warehouses for storing the goods, putting up to date the cranes for unloading the cargo, checking the railways for bulk transport, and a lot of other details. All of that is in the hands of BBPA and City Hall.
Oh, and Taylor didn't clear the access channel, so it has to be clogged with sediments.
