I think it is important to remember that not everyone buys a steel Nautilus or Aquanaut because of the perceived hype or as an investment. When I bought my 5167/a it was the cheapest Patek model available, had a cheap tacky plastic strap, was considered the poor man’s Patek, sold at a discount and was the inferior little brother of the 5711 in every online review and forum thread I read at the time, and it’s my favourite watch.
In the UK the blue dial 5711/1a has re-sold at a premium and has been a waiting list piece for “many years before” all this hype started, the hype has just made the wait longer and the premium higher. I can’t predict the secondary market, but don’t see the steel blue face 5711 or its direct descendant (if discontinued) being sold below or at retail in 2020. I can however see the UK retail price rising in 2020 by 5-10% perhaps on or around 31st March 2020.
