Once a 64bits risc-v code path is stable, does a good enough job, is rid of its "buffer overflows"... how they are going to do planned obsolesence without C/c++

Once a 64bits risc-v code path is stable, does a good enough job, is rid of its "buffer overflows"... how they are going to do planned obsolesence without C/c++ always changing syntaxes?? Poor souls...