I am thinking of the same. Even though I have a Bachelor of Science (BSc) in Computer Science, it has been 14 years that I actually used any of it. I regret it sometimes since I know what it is to know how things work underneath the high level languages (PHP, JavaScript and Python for me).
Lately I have started taking more interest in CS and I think part of the reason is Rust. You could be learning Go, Swift or any similar language and come to similar feelings.
In Python (my language of choice for the last 7 years along with JavaScript) I do not really have to care about pointers, stack or heap allocation, how memory gets create or cleaned, etc. I also do not need to know if there is a virtual machine, a garbage collector, etc. Data types and how they are handled are somewhat important but I rarely get slapped by the Python interpreter for mistakes.
To me it seems that a lot of developers are choosing to go into more typed and lower level (closer to metal) languages. My gut feeling says this is happening because we can not crank up core speed from 2GHz to 3Ghz to 4Ghz and beyond as easily as we did pre-2Ghz era. Yes we hit ceilings of per-core power. But we have more users than ever before and the world seems to be eager to bring computing to even larger audiences.
All this is great, but it means developers need more refined and powerful set of tools that can work in low-power environments, boot up fast and deliver more computing throughput. The high levels of abstractions that most of us have enjoyed will stay but there will be new territories where you want to push code that is way, way more efficient. If we want to work with them, we need to know not only how to push a Template into an `<H1 />` but about the metal that is underneath. From how browsers work internally to how networks work, how processes work or communicate, how memory is allocated and so forth.
So this is a choice we have to make individually. I choose to learn and I am going with Rust and spending time to learn CS again. It is a slow process though, I have full time commitment to my product as a solo founder. Cheers!