What are your favorite resources for learning / reference in regards to embedded systems?
Simply buying any one of the cheap boards you can find online (if they have supply) and trying to get something like a JTAG debugger working will be beneficial to you. Just try to get something simple going on bare metal. It's been a while since I worked with PIC microcontrollers, yet as I remember there is a lot you can do with some of the cheap PIC devices, a breadboard, and an investment of $100 - $200 in electronic parts. It was important for me to build up a modest lab of electronic test equipment, power supplies, breadboards, etc.
Wishing you success, whatever route you go.
"The Wheel Of Reincarnation" described by Ivan Sutherland is closely related, but is based on the idea that computing history is more like a spiral than a straight line, so the future is more similar to the past than to the present.
In 30-40 years, I wonder how many things from that old guard will still be around.