I am sure the diamond landscape will change little by little. Private jewelers like Jann Paul in Singapore runs a brick-and-mortar store but they provide all the education of all the images in 2 hours. If one day local jewelers see such value, maybe they will adapt as well. Once they adapted, the suppliers will have to adapt as well, so do the cutters. However, I think the change will be slow because profit probably still go first, and those big players may feel reluctant to allow the cutter to spend much more time to craft the diamond to a top precision. Besides, some cutters may need to be trained, if they do not have such skill sets. Maybe things will speed up as digital economy blossoms further.

As for your question on how to dispose the existing diamonds, I can think of 2 ways:
1. Like you said, cheap sales / any promotional activities.
2. Send the diamonds back for re-cut, which I think may be impractical due to the cost, but there is a possibility to do so.

The ASET of that G VS1 you chosen is not that good at the upper right hand side of the table. It seems to be leaking light there. The ASET in the ceritifcate also indicates there is a part with weaker light return.

This will be a better option, as far as 40-pointers are concerned:
https://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link). This diamond has excellent light return and fire. The lower girdle is at 77%, and it should show some bold flash instead of pin-fire flash.

There is another 40-pointer that shows great fire and light return as well:
https://www.whiteflash.com/loose-diamonds/r...id=myengringexp (affiliate link). This should have bolder flash because the lower girdle is even lower at 76%. However, I noticed that this diamond's Hearts and Arrows pattern is not as good as the F VS1 above, hence the F VS1 above will be my first choice.

I did not exactly browse through each available 40-pointers within the F G colour range as I am abit busy at the moment, but the 40-pointer I chosen earlier will be quite an excellent diamond that I will shortlist to buy myself.

As for whether to downgrade clarity or not, it is okay as long as the inclusion does not bring any risky factor to the stone.

Hope this helps.

Here are some other options:

https://black.briangavindiamonds.com/diamon...?a_aid=myengexp (affiliate link) This is a G VS2. I like this in particular due to its high contrast in the ASET of the certificate.

https://black.briangavindiamonds.com/diamon...?a_aid=myengexp (affiliate link). This is a F VS2. This is actually not bad as well. Although it does not show as much contrast as the G VS2 above, but its contrast level is already pretty good. Minor complains may be the arrows of the H&A may not seem to be as "pretty" as some other Black by Brian Gavin, but this is just splitting hairs.

https://black.briangavindiamonds.com/diamon...?a_aid=myengexp (affiliate link). This is another F VS2. It is pretty similar to the F VS2 above. Minor complain is that there is weaker light return at the 12 o'clock edge of the diamond, if you refer to the ASET image provided. Although this is just a minor issue, it is pretty surprising as Black by Brian Gavin should not show such weaker light return, since it is brand as a better signature stone. Anyway, other vendor's super ideals do exhibit such pattern as well.

https://www.whiteflash.com/loose-diamonds/r...id=myengringexp. It is a 0.56ct F VS1 (affiliate link). This diamond is pretty interesting. Although the video looks not as sparkly as the following diamond:

https://www.whiteflash.com/loose-diamonds/r...id=myengringexp. It is a 0.541 F VS1 (affiliate link)

I will still buy the 0.56ct because of the ASET in the certificate shows more contrast. I believe, in real life, things will be more interesting on the 0.56ct.

Is 0.541 any good then? Absolutely fine. In fact, it produces bolder flash because the lower girdle length is 76% compared to the 0.56ct which has lower girdle length of 78%. In theory, shorter lower girdle length will produce fatter arrows and also produces bolder flash. It is good to buy the 0.541 if you want bright diamond with bold flashes. But personally, I prefer more fire, and 0.56ct seems to be able to provide that.

Although the video does not show that 0.56ct looks better than the 0.541ct, but I am willing to put my trust on it, after seeing its proportions and ASET in the certificate of the 0.56ct. Just personal preference.

No problem. Glad you and your wife like it.