In the next 100 years, do you think Governments will create their own cryptocurrency or digital currency that will replace fiat currency, i.e. coins, paper money, the paper dollar, etc.?
If it does happen, will it be like bitcoin or will it still represent gold like how today's money works?
No, nothing serious will happen. States will create their own centralized cryptocurrency, but it will only slightly press the national money of the states and will go along with the national paper money. All types of currencies will go simultaneously. In addition, there will be other types of means of payment. However, it must be remembered that a decentralized cryptocurrency exists by itself, it cannot be tied to the economy of a particular state, and therefore can never replace the national money of the states.