This guys can really be a game-changer for the crypto community. I am very glad that such renowned experts have chosen to rate cryptos. To be honest if they weren't independent it certainly wouldn't have had the same effect.
Also when someones says that "BTC costs what it costs only because someone else is ready to pay X amount" If we take most of the traditional currencies, what are they backed by ? The government says 1$ is 1$ and thats it, they are not backed by anything, except the government. And currently the US government is 106% of GDP in debt, Japan is 250%. Why would I trust the government with the money ? Or any institution for that matter.
I think you're right in thinking Weiss is a game changer. Adding crypto to their universe of investment analysis certainly raises the status of crypto in the eyes of the outside world.