The current median LCOE for new offshore wind is ~$125. Reducing capital costs to 30% could bring the median LCOE down to ~$67.
That would make offshore wind a good deal cheaper than all fossil fuels [2]. Natural gas, pre-war, was the cheapest - at about ~$75+.
Onshore wind saw a ~50% decrease in LCOE in 2011 [3]. This could lead to a similar decrease for offshore.
Solar is gaining ground rapidly - 38% growth from 2010-2020 vs 16% for wind. But solar isn't perfect. In the US - we have 3x more wind energy production than solar [4]. But >90% of that is onshore wind - because it was previously so much more economical.
A massive improvement like this for offshore could be huge! If we could add as much offshore wind as we do onshore wind - that could cut out an extra ~12% of fossil fuel consumption over the next decade.
[1] https://www.mdpi.com/2071-1050/13/14/7943/pdf
[2] http://www.globalwarming-sowhat.com/renewable-energy-/
[3] https://www.lazard.com/perspective/levelized-cost-of-energy-...