It may take a long discussion till we see real world decentralization in stock market but we have been seeing BTC on FOREX and NASDAQ which we can now consider BTC is accepted investment. A long discussions for Financial Regulations and law and then SEC which had been delaying everything but once finalize I think it can happen faster. There are projects/platforms that will tokenize businesses/companies in stockmarket and probably even those in DOW, I guess they can use the platform if there really is a plan to make stock market decentralize.
This can, of course, take time because there is no magic bean here. There are many factors that have to be consider first before we can go full blast with decentralization and with the weaknesses of human nature we don\t want this to be abused so we should take one step at a time to make sure that at the right time everything can be all ready.