I guess tape is still a much cheaper solution for backing up large databases. Though it's useless for anything else. However, the technology will probably port over to hard drives.
I love tape for backing up huge databases. large size, (typically low) file count, and 0% deduplication rates. also for stuff that clients need backed up and then physically stored offsite for a long period (we do disk replication between data centers, but if a client wants their backups retained for several years, that shit is going onto tape and shipped off to Iron Mountain)
otoh, for anything else I'd rather backup to disk and dedupe it.