Agreed. Given the breadth of today's sci-fi culture, there need not be a reset to remind new generations of viewers the purpose of Transformers transforming. Humans were originally necessary to justify that Transformers transformed into something. Big robots pew-pew-PEWing each other or other aliens in space with multi-toned lasers should suffice as appeal (or at least to my limited intellect).
I wonder how today's kids will take it if Hasbro out of nowhere makes a movie that brutally kills off 80% of the TF Prime characters kids love and force introduces a whole new crew & set of toys.