Python is just a very nice interface to a large amount of optimized C code.

Don't neglect the Fortran code!

I would have agreed with you in 2013. Now it's just seems so fractured and all over the place, like it's had it's peak and is on the way back down.

Sometimes fractured and all over the place is a sign of success. Python is used by a huge variety of different communities for a myriad of use cases, which is pulling it in different directions. That’s not a bad problem to have, as long as it’s managed well and the core webs seem very tuned in to this issue.

Also the community migration to Python 3 is done now. Yes there are massive P2 code bases out there still, but for new projects P3 has been the clear choice for a long time now. It’s over.

python won't last, just like ruby / js / php

I sense a strong convergence between all of them (builtin DS, linguistic traits, bits of static typing)

JavaScript will last. There's no question there at all.