Unfortunately FFXI is now officially in maintenance mode (which I suspect is exactly the reason why we're getting a FFXI themed raid in DT here in FFXIV), as a final hurrah for the earlier game), so it's unlikely SE is going to add or change things with it, and yes, it shows it's antiquated nature all too much (remember, FFXI was first released back in 2002 in Japan).

SE actually tried a bundled subscription model for FFXI and FFXIV back in 2010 when FFXIV version 1.0 was released - sadly few took up the offer and so they eventually cancelled it, and so it probably put them off from ever looking at such an idea again.