It would be interesting to see why you think Bitcoin (or other cryptocurrencies) will surpass traditional methods of payment (Cards, Bank transfers, payment gateways etc.).
Bitcoin was created to have a decentralized version of fund transaction between one user to another user on the internet without having a middleman or a trusted financial institution. They are an alternative to Bank Transfers while Cards and Payment Gateways are still possible with bitcoin and we cannot categorize them as traditional methods of payment. The primary idea is to prevent banks and centralized financial institutions in playing a role in our transactions on the internet. As like people tend to use fiat money even after the introduction of Credit and Debit Cards and the same goes with bitcoin. Bitcoin will stay as well as fiat money would stay here. It is upto the marketplaces or stores to accept bitcoin or not.
A common scenario favoring the usage of bitcoin is like : We tend to buy goods from market and pay using Debit or Credit Cards. What if there tends to be a problem with Card machine and there is a withdrawal from your account and there is no sign of deposit to the merchant account? What if you didn't get your money back? I have experienced this and got back my money only after providing evidence in Bank the next day. With Bitcoin, all you need is just a transaction ID and with providing that, merchant would let you go with your purchased goods.
Or if you think they have no future please share why.
We are in the initial stages of the development of something like a virtual currency and it would significantly take time to reach the goal of being used by merchants. People who would go with supporting the government and the plans they are undertaking, would always speak against bitcoin. They would never support the technology even if the technology tends to overtake the current banking system.
Speed: BTC is known to be slow to confirm a single transaction (approx 10 mins). ETH is faster (approx 15 seconds). I believe (correct me if i'm wrong) that if you cut down block times it slowly starts to make a decentralised system more centralised.
10 years into the technology and are we in need of rapid developments? Not many are still really aware of bitcoin and if many become aware, we would see a rise in developer count and significant developments would take place. Aren't we aware of Lightning Network and other scalability options? We can always have a hard fork and increase the scalability, but with the community support and through a soft fork or off-chain payments, I don't think we would face scalability issues in future.