Hm I don't find it that interesting. I think most people in the industry already know which coin could have the potential to surpass Bitcoin one day. Yes indeed it could probably only be Ethereum for now. What I always think when investment banks announce something or share information is that they follow an agenda. I guess Goldman Sachs is sitting on a ton of Ethereum and is now slowly but surely starting to spread the news. Once enough people are aware they might even start pumping Ethereum and publicly call themselves out as clairvoyants.