Ok sure, but the issue with the top 10 coins is that there are heavy correlations between all of them.
I wondered whether anyone had thought of diversifying their crypto holdings with less correlated assets (public equities, bonds) etc. or potentially illiquid tokens (real estate, art)?
It's definitely true in this bear market everything is following bitcoin down and up to a T, but in healthier market conditions, most things act independently.. It wasn't until Bitcoin started on that parabolic runup and then strangle-holding alts with the forks last year that made everything start following the King. I do think if the volatility bothers you though, maybe go for some more stable assets like you suggest.. I'd personally choose something like Real Estate if you have that level of income... appreciates overtime (usually) and reasonably stable.. you can also earn income renting the property to make money off of making money.
I do think Crypto's volatility though is what makes it special. I think viewing this as a hold and wait sort of portfolio management style is not capitalizing on its full potential... We're in market cycles where money tends to move around a lot but the market cap is just staying relatively the same and smart money is scalping profits and moving them out of alt coins. As wild as it was in December, almost all the gains won in the alt market were quickly stripped away if people didn't shelter quickly to BTC or shelter of the shelter to Tether. I think the best way to play this market is to start recognizing the market cycles, participating at the top and bottom, and then move profits away to USD or accumulate BTC to help control the volatility (at least to the downside).