I don't see 67 million files becoming the norm any time in the foreseeable future, even with multi TB drives. Over time the size of files tends to grow much more than the number of files people have. Your average person a few years from now with a 4 tb drive likely will be using much of that storage to hold large video files or something. People with unusual and/or extreme configurations that require that many files and don't mind splitting into multiple partitions can do so, but I don't think that is the norm and so the default configuration does not need changed.
I don't even see how splitting up the disk into multiple partitions would help matters any; the total time to fsck them all would be the same.
I don't see 67 million files becoming the norm any time in the foreseeable future, even with multi TB drives. Over time the size of files tends to grow much more than the number of files people have. Your average person a few years from now with a 4 tb drive likely will be using much of that storage to hold large video files or something. People with unusual and/or extreme configurations that require that many files and don't mind splitting into multiple partitions can do so, but I don't think that is the norm and so the default configuration does not need changed.
I don't even see how splitting up the disk into multiple partitions would help matters any; the total time to fsck them all would be the same.