Sussman created a follow-up course to SICP [2] which is still based on Lisp and still being offered today.
so the move away from lisp is not bad
and while i dont like python purely as programming language (its not theoretically engaging or fun) python is top 3 or 5 in practice, people like it
Learning this or that programming language isn't at all what it's about--you can (and will over and over again throughout your career) do that on your own time. It's about developing the abstract thought pathways that enable you to quickly learn and think about computing.
I don't know why MIT chose to stop teaching the course, but it sure would lower my opinion of that institution if it was something to do with the direct commercial appeal of "knowing Python".