Cobol's still around. Just because a language exists doesn't mean that we have to keep releasing updated specifications and compiler versions rather than moving all those resources to better languages.
COBOL's most recent standard was released in 2023, which rather ruins your point.
I think the existence of COBOL-2023 actually suggests that it's not merely possible that in effect C++ 26 is the last C++ but that maybe C++ 17 was (in the same sense) already the last C++ and we just didn't know it.
After all doubtless COBOL's proponents did not regard COBOL-85 as the last COBOL - from their point of view COBOL-2002 was just a somewhat delayed further revision of the language that people had previously overlooked, surely now things were back on track. But in practice yeah, by the time of COBOL-2002 that's a dead language.
Fully agree, because for the use cases of being a safer C, and keeping stuff like LLVM and GCC running, that is already good enough.
From my point of view C++26 is going to be the last one that actually matters, because too many are looking forward to whatever reflection support it can provide, otherwise that would be C++23.
There is also the whole issue that past C++17, all compilers seem like a swiss cheese in language support for the two following language revisions.