There will no be worsening of volume loss after resorption of the hyaluronic acid filler. Natural hyaluronic acid is constantly produced and broken down in the skin. Studies have shown that modern hyaluronic acid fillers have good tissue integration with the skin with little ill effects.
Volume loss is due to age-related, localised reduction of facial fat and bone loss, aggravated by loosening of the skin. This ageing process will not be affected by filler treatment, so there is no need to worry about this.
You can find more information about dermal fillers in my article here
Cheers,
Dr Terence Tan