The interesting thing about electrochemistry is that it can be used for many different things, so it will likely be used more and more, rather than stop being useful. It has a lot of applications in energy, which is at present (and will be in future) very important to all of us:
For example, we depend more and more on batteries, because we have lots of electronics and things that need energy while not being connected to a plug… Electrochemistry is involved in that because battteries are essentially mixed of metals or other chemicals which can generate electricity.
On the other hand, things like solar cells or fuel cells which are ways in which we want to generate energy/electricity either from the sun (solar) or form chemicals like hydrogen or biofuels (fuel) are also developed and studied by electrochemists.
Then it can be used for many other things like sensors, for example detecting carbon monoxide or other harmful gases, or for different diseases, like in detecting glucose levels (which is really important for people with diabetes).