RE: Cards can become useless in the near future

Things are changing very fast in today's financial market.
A lot of institutions are trying a lot of different things and innovation is at it's peak.
While these new features are making our life a lot easy but they also pose security concerns, as you have already explained.
Don't leave you phone in unknown hands. It's easy to clone the SIM easily these days. Having a strong phone pin/pattern is very important.
Other thing is educating people, it's was very hard to get people to use ATM cards as lot of people would not understand the process and always needed assistance to withdraw money from ATMs, i have experienced this in my family.