Is the SANFL really a state league?

How is it that the South Australian National Football League can actually be called that?  I mean, it doesn't have any teams from anywhere in the state except for Adelaide.  It doesn't even have teams from anywhere else in Australia; perhaps the SANFL should be renamed the AMFL - Adelaide Metropolitan Football League.

With the advent of the Australian Football League (which many view as simply a glorified Victorian Football), interest in the SANFL wained considerably.  While popularity in the Adelaide competition has improved in recent years, it could sure be a lot stronger.  Invite teams from the two largest cities outside of the SA capital - Whyalla and Mount Gambier - and you could genuinely call it a state league. 

While the SANFL was unsuccessful in having a team from the Northern Territory join, why doesn't it invite teams from Hobart and Canberra.  That way the word National could actually belong in the name.  Not to mention that it would certainly give the AFL something to think about.