Hello,
I'd like to know if as a BTC enthusiast, you'd like to trade those types of financial products with BTC pairs like GOLD/BTC, NIKKEI/BTC and so on.
If I ask you this, it's because I've developed a trading platform with this possibility, however I don't know if there is a real demand...
I think the biggest problem will be legal, the trading platform doesn't look like to be the real issue .
You will also need high volume against all pairs, which is unlikely to happen (unless if you own a coinbase binance or something like that).
Probably BTC/GLD (Gold ETF) and some other indexes funds will have a high demand.