Real rolling objects on a horizontal plane (i.e., for $θ=0$) do not slow down due to static or dynamic friction but aerodynamic drag and rolling friction (caused by deformation of the rolling object). The former two occur when two surfaces move against each other, which does not happen during pure rolling motion, i.e., as long as the rolling condition $ωR = v$ is met. As rolling friction is excluded (your ball is rigid) and air resistance is not mentioned, the ball will just continue rolling when on a plane.
Static friction plays a role on an inclined plane since it causes some of the downhill force to accelerate the ball rotationally instead of linearly. (This is as long as the downhill force is smaller than the static friction.) If you place a resting, non-rotating ball on an inclined plane without static or dynamic friction, it would simply slide down the plane without rotating.
Dynamic friction becomes relevant if the rolling condition is not met.
We then have a rolling-with-slipping scenario, and the sliding friction linearly decelerates and rotationally accelerates the ball or vice versa until the rolling condition is met.