Why will decimal128 be probably standardized and quad precision will not?

This is a very naive question. If we look to the C and C++ standards committees, they are currently working on adding decimal floating point standard types:

• link to the C proposal


• link to the C++ proposal

So it seems that we will probably have a standardized decimal128 type while we do not yet have any standardized binary128 type (quad precision and not simply extended double precision). Is there a technical reason for this situation or is purely "political"?