The process of technological substitution

There is always a process involved in technology replacement:

1) Finding technical possibilities;

2) Finding the acceptable cost price and mass production process;

3) Starting to gain application, and further reducing the cost and price;

4) The host machine factory began to adopt the new host machine. Even so, owners of devices that are already in circulation don't just throw away existing devices, as they do with mobile phones.

So, it needs to take time. Hydraulic technology, which has been developed by hundreds of thousands of people and used by millions or even tens of millions of people, has a wide range of applications. Even if any new technology can be replaced, the process of being replaced will last for at least 10 to 20 years. In these 10 ~ 20 years, how many innovations hydraulic technology itself will appear?