You need to elaborate your question first. What do you mean by shared assets? If you are talking about eth based tokens or altcoins backed by real life assets like gold, silver, oil etc than there are many out there. Only few of them got success, main problem with such assets backed tokens is transparency of the total assets held in the vault.
yes, i was basically talking about altcoins backed by real life assets. I want to understand their future generally, in long-time perspective