First of all, as some American comedian once put it so nicely: "What you see is what you get". In other words, don't look too far because you're not going to find much.
The list of Bordeaux Chateaux producing kosher editions on a regular or periodic basis is indeed a long and quite respectable one and includes among others the wines of Barons Edmond and Benjamin de Rothschild, Chateau Malmaison, Chateau Cheval Brun, Chateau Frombague, Chageau de Gairoird, Chateau Giscours, Chateau Haut Philippon, Chateau Labegorce, Chateau Labegorce Zede, Chateau La Clare, Chateau Lafon-Rochet, Chateau La France, Chateau Le Crock, Chateau Leoville Poyferre, Chateau Montviel, Chateau Patris, Chateau Peyrat-Forthon, Chateau Pontet Canet, Chateau Roc de Boissac, Chateau Rollan de By, Chateau Royaumont, Chateau Smith Haute-Lafitte, and Chateau Valandraud.
Among the historical reasons for the "kosher connection" with Bordeaux were the demand by Jews in the UK and later in the USA for quality kosher wines and because of what might be thought of as a fairly heavy investment by Jewish families within Bordeaux who were open to the suggestion. Not one of the best chateaux would dream of "going kosher" but many will consider doing special kosher bottlings on the demand of primarily American and some English importers who have developed a market for such wines.
Going beyond Bordeaux in France, most of the kosher wines are done on a fairly "catch as catch-can" basis, that on special order by negotiants located both within France and the USA. That is to say, the negotiant will find a willing winery, a wine that they consider acceptable and then go for a kosher edition. In most cases those do not come as editions from a given producer but as private labels. There are some exceptions in France to this – e.g. Chateau Ministre in the Coteaux du Languedoc and Domaine St.-Benoit in Chateauneuf-du-Pape. In Burgundy many wineries produce relatively small quantities of wines and it is simply not worth their effort to produce a kosher edition. The exception in Burgundy are again negotiants who will order private label kosher wines.
When it comes to Italy, Spain, Portugal, Germany, Chile, Argentina, Australia, and New Zealand, several wineries do release kosher editions but with a few notable exceptions, those are usually negotiant or private label wines and although some of those can be quite good, they do not include any of the truly great wine producers of those countries. There are also several wineries in each of these countries that produce only kosher wines, those varying in quality from the poor to the excellent.
As to the hope that some of the best wineries in these countries will begin producing kosher editions, let me only suggest that you do not "hold your breath" in anticipation. You'll have a long and difficult time without oxygen making its way to the brain. With full respect to those who keep kashrut, this is simply not an audience large enough to make such additional effort or expense worthwhile. Being quite realistic, there is going to be just so much space on shelves and so much money to be devoted to advertising and promotion. The kosher-observant crowd is simply not voluminous enough to make such changes. As such people have adjusted to limitations on where and what they can eat, so they must make the adjustment to where and what they can drink.
All of which is not so bad as the quality and availablity of kosher wines, not only from Israel but especially from Napa, from South America, from Spain and France continues to rise. Some say that at least several Jews (e.g. Einstein, Karl Marx, and Sigmund Freud among others) have changed the way we perceive our world. I tend to agree with that but I will promise that we Jews will not have a major impact on those of the great wineries of the world when it comes to producing kosher wines.
With specific regard to Chateau d'Yquem, I suspect that the only time we will see a kosher wine from there is if the Messiah chooses to appear and, after settling the affairs of our little planet, decides to do a stage at that noble establishment.