Actually your question is coincidentally very timely.
A group in USA called "Chasing Classic Cars" held a static display at Blackhawk Museum on May 3rd (so just 2 days ago).
There were 900 cars on display. And not one was a Skyline according to my friend L Barry Chafin who races RX8s over there.
IMHO, much will depend on how much the R32 GTRs will be cherished and then admired. L Barry I think believes that word will spread about the beloved BNR32 like wildfire. He says (being in the know) that he wants one himself.
So if L Barry is correct, the demand for the BCNR33 in 2020 looks promising. But it all hinges on growth of demand at Japanese auctions for the R32 GTR.
I'm wondering if our USA neighbours have eyes on R32 GTRs in UK, Asia and here.
I'm an Admin of another car club which includes international members and that is why I'm familiar with the above.