Commercial spaceflight for NASA reminds me of when the Postal Service contracted out airmail. From 1918 to 1926, all air mail service was flown by US government pilots, in US government planes. Then they contracted it out to a little airplane company named Boeing.
I think NASA should absolutely be focused on deep space exploration, and LEO operations. But even if all they do is contract out their launches it would encourage people to reduce launch costs, which I think should be our number two goal after fighting climate change.