Quite so. The soname link problem is present in both the 32-bit and (old) 64-bit library directories. It is still present in the 32-bit library directory.
You can do tricks with tiny chroots and ldd(1) to make sure you have total library coverage (excepting, probably, glibc, Mesa and the X11 libraries, I think we can assume that people have a compatible version of those, since they haven't broken ABI compatibility since the 80s or 90s): I can provide a recipe if you wish.