A UTXO data set is nothing more than how you account for the tokens. If you change the structure of a transaction in specific ways you can create a scenario of the new TX being incompatible with the old TX
I think the best alt to hodl is either ETH or LTC because of high market caps and stable-ish prices. VTC has potential for investment but dangerous. XRP i see potential in the tech but prob not do well for a while.