Correct. Another way to think of it is that magnetic field lines only form closed loops - they can never begin or end.
The fact that the B field lines never begin or end is not mutually exclusive with a change in the magnetic field intensity. In regions of higher magnetic field intensity, the field lines are "packed closer together", and in regions of low intensity the lines are further apart. Look at the attached image of the B-field of a current loop. The B-field lines are closed loops that are closer together near the current loop and further apart far from the current loop.