"languages" for SageMathCell are very different from kernels for Jupyter. SageMathCell keeps a bunch of preforked kernels (all are the same), so that new computations don't have to wait for startup. "language" just turns "code" into something like "print octave.eval(code)", which is then sent to the same kernels as Sage. Supporting Python2 and Python3 kernels simultaneously would require substantial adjustments to how kernels and languages are managed. An alternative I mentioned at sage-cell is to have different domain names for servers running different versions. Since we currently have 2 servers, it is doable, but we will loose redundancy.
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