Hi Eli, thanks for reading and commenting. Good question. Nano is just another of the many thousands of coins that some claim can replace Bitcoin, but the reality is that unless something changes they won’t. None of these alternatives have anywhere near the market power, hash power, community support or influence to be a serious contender even if they are ‘technically better’ (although I disagree with that assessment too).
In short Bitcoin now has the most reliable, most secure network on the planet by a long, long way. Therefore, it makes sense to build a second layer (assuming it can be made to work effectively) on top of that secure, decentralized network.
Hope that answers your question!
Thanks and regards