Most will likely have no value. But some will become extremely valuable, and that's what it's really about. Whether it leads to confusion or not likely will have more to do with user interfaces than anything else. After all, if there are a million SMTs but no one ever sees them, why would they be confused? In the end, we can always choose to only show STEEM, and as of now Steemit does not have any plans for adding any tokens to steemit.com, including SMTs. The assumption is that, of course, at some point we will, but even then we will likely limit our interface to displaying a small number of them, and leave it to the user themselves to determine which coins they want to see.