^For now, true, but what happens when those new fans get tired of Kirk and Spock, a reboot reboot with NuNuKirk and NuNuSpock?
When 'new fans' become tired of the rebooted trek fanchise, it will no longer make enough money and Trek will get shelved or rebooted again to a new generation of audiences.
The concept of Kirk, Spock and the original crew works on a popular culture level.
Captain No-body in the Starship el-camino only appeals to a few hundred viewers at best, that is no basis to risk millions of dollars to launch a new TV/Movie on.
Not to mention making Trek even less accessible and tasteful