These days "little RAM" is still often 265MB or more. x32 kernels would be a rather short term proposition given that the comfortable limit of 32-bit is 2GB, and maximum is 4GB, only 8-9 times less than that limit.
Even phones and tablets are pushing the 2GB mark.
Sure, truly small embedded Linux devices continue to exist and will for a long time to come. They're rarely x86 or x64, and aren't likely to be, so x32 is irrelevant for them.