Today, Bitcoin is not just a cryptocurrency, it is a symbol and a brand in the market. It is seen as 'digital gold', with unmatched security and decentralization.
To replace it, a new cryptocurrency would need to have all of its advantages (secure, decentralized, immutable network) and something revolutionary — like global scalability, instantaneous transactions, and almost zero fees.
Some networks like Ethereum, Solana, or even fast payment-focused projects like XRP technically surpass BTC in some points, but none have managed to overcome Bitcoin's status and trust.
Time forecast:
Historically, leading coins stay on top for a long time. BTC has been strong for 15 years and continues to dominate.
Realistically, if it happens, a replacement could take 10 to 20 years — and even then, it is more likely that BTC will continue to exist as a store of value, even if another coin leads in everyday transactions.
Cryptos with the greatest chance of rivaling BTC

1. Ethereum (ETH) – The closest at the moment
Why it has a chance: It's the largest smart contracts platform, with DeFi applications, NFTs, and over 70% of existing tokens running on it.
Strong points: Highly utilized network, increasing institutional support, upgrade to Proof of Stake (less energy consumption).
Weak points: Still has scalability bottlenecks and high fees during congestion periods.
Time forecast: It could match BTC's relevance in 8 to 15 years, but not completely replace it.
2. XRP (Ripple) – Focus on fast global transactions
Why it has a chance: Aims to be the digital banking system, already used by various institutions for international transfers.
Strong points: Transactions in seconds, almost zero cost, support from banks and large companies.
Weak points: Greater centralization than BTC and a tarnished image due to legal proceedings (even having won some).
Time forecast: It could become the global currency before BTC, but it would take 10 to 20 years to rival in market value.
$SOL
3. Solana (SOL) – The technological rocket 🚀
Why it has a chance: Extremely high speed, very low fees, rapidly growing ecosystem.
Strong points: 65,000 transactions per second, minimal cost, attraction of developers and institutional investors.
Weak points: History of instability in the network, still in a maturation phase.
Time forecast: If it solves the stability issues, it could grow significantly in 5 to 10 years.
4. A crypto that doesn't exist yet 💡
Why it has a chance: The history of technology shows that today's leaders may not be tomorrow's leaders. A new coin with disruptive technology + mass adoption could emerge and change the game.
Time forecast: Emergence and dominance could occur in 15 to 25 years.

My view:
BTC will not 'disappear' or 'die', but it may be that, in the future, it becomes just a global vault and another crypto leads as a daily use currency. Something like ETH, or perhaps something that hasn't even been created yet.
💬 Final summary:
BTC will likely continue as 'digital gold' for decades.
Ethereum is the most likely to rival in the ecosystem aspect.
XRP has a chance in the field of fast global transactions.
Solana is the boldest and most technological bet.
There is always room for a new, yet unknown, coin to take the throne in the future.