Salinity levels will vary, but there is no trend to increasing salinity globally. Remember that water is still being “added” to the surface through volcanic act

Salinity levels will vary, but there is no trend to increasing salinity globally. Remember that water is still being “added” to the surface through volcanic activity, and the water cycle dominates, while the current rate of loss to space is quite low. I’m not sure whether volcanic activity is likely to slow before Sol starts to seriously cook off our water, but one of those would eventually lead to a reduction of surface water. That in turn, as with the Dead Sea, will lead to a higher concentration of dissolved solids in seawater. The current (meaning billion+ years) homeostasis goes like this: https://science.nasa.gov/earth-science/oceanography/physical-ocean/salinity https://science.nasa.gov/earth-science/oceanography/physical...