I do not know how many faces this problem. If I do programming in weakly/dynamically typed language like python,php,javascript for few days I lose touch with strongly typed languages like c++,Java,.net. I recently heard languages like python and ruby which people loved programming in.
It is very easy programming in weakly/dynamically typed languages, but there is a danger of losing touch with languages like c++,Java. Processors now becoming very powerful and according to Moore's law it will increase speed with time exponentially. So efficiency may not be issue as similar thing happened when we shifted from embedded to high level languages like c++,java.
Moore's law is in danger, as the processor speeds can't speed up at the moment, so they just put more cores on each die (more processors/processor chip).
Which is why functional programming is becoming popular again.
If you are working in critical environments, such as a nuclear power plant, or avionics on airplanes, a weakly typed language won't be used, as it can't meet the requirements imposed by these areas.
The world continues to move toward the language or framework that best solves the problem. Some people may try to force using a particular language, but, over time, if it is seen that there is a better language for that problem, the migration will be toward the better language.
It is important to understand both though, I believe, as there are areas where a weakly typed language works best, for example, having javascript applications, where you can send code as data, then execute it. That can be very powerful.
Strongly typed languages will remain the primary language for enterprise apps, as the compiler can help determine if there are errors due to a mismatch of data types that are hard to troubleshoot in weakly typed languages.