I'll give it maybe 30 years before the cables are questionable.
The 2 big no-nos for bridges in coastal environments, as far as durability goes, weathering steel, and cables. So, 1 out of 2.
As much as I love my bridges, I think this should have been a tunnel. That said, I don't know what the ground is like in that area, so maybe tunnels were genuinely ruled out for geotechnical reasons.