When you think of coding money, you often think of Bitcoin. But now, Bitcoin seems to have become "outdated" and the following altcoin threaten Bitcoin's market dominance in the future. Here I am talking about the Nano(XRB). Nano can handle 7,000 transactions per second and this rate can increase over time and can even compete with Visa. The secret behind this is the block network architecture, which allows transactions to be processed extremely rapidly. This transaction speed allowed the Nano to become a potential co-dominant market for Bitcoin's pre-encoding market.
What do you think about XRB?
While there are no doubt plenty of good alternative coins available i don't think any of them will ever be able to replace bitcoin. Yes some may have better technology but most of these can be integrated into the bitcoin network over time(albeit very slowly).
Further Bitcoin is still the only coin that truly posses the characteristics of sound money and is the only coin with the sufficient network effect/ massive community and adoption/ and true decentralization to be able to be used as a future world currency/reserve currency/gold like trust less commodity.
Personally i don't think any currency that is deflationary(has a hard cap on total supply) can ever be used a day to day currency, because in this case the incentive to hold will always be stronger than the incentive to spend. And the nature of economics means that this could lead to massive societal problems.
I think the role of bitcoin is more akin to a trust less asset/ digital gold than as a world wide currency to be used on a daily basis.