To the original question:
Model will stay. It's obviously extremely profitable. That's why amazon went same way.
Two ways of the model developing.
We either get most if not all of smartpost back once the USPS hikes up the rates. Which in turn will drive down our per package income, but in general will significantly improve volume/density.
Or, we lose most of small stuff to USPS, Amazon or UPS (once they sign) and become a furniture/chewy delivery company.
So take your bet at which trucks to buy.
PS 7 days obviously.