There are not that many useful tasks that can be solved in principle with massive use of rockets based on chemical reaction. But none of these tasks are "mission critical" for survival of the civilization.

Having 10 companies launching rockets instead of current 5 will not make any differences in principle.

It is just a matter of time for next gamma burst or so to wipe out life on the planet. So we need colonies on large enough distances. And Mars does not count as it is too close.

To achieve that goal (civilization survival) we a) must keep our common home habitable and b) focus efforts on finding ways of inter-stellar travelling.