Common sense eventually prevails with this stuff.
Whilst the picture looks great, the reality is money, and another environmental mess... I guess the closest thing to this is the concrete swimming pools through Sydney (beaches). And mostly they are moderately small, tucked up against existing rocky headlands... And even partially within the existing rocky areas... Therefore, being pretty unobtrusive, on the whole...
And - you know what, it just won't happen.... This type of thing needs State and potential Federal approvals. There is no way in freaking hell that I can see this even getting State level approval...
The knob who thought up this idea, with his local little panel (group) will forever remain a knob, ... until the day he dies... And even after he dies, some people will still remember him as a knob! Lol! Sorry (not sorry)!