They've already redesigned the Crystal Tower raids in the mobile remake to make them 8-man. That is the standard they intend for it going forward for future updates.

Genuinely think it's only a matter of time before FFXIV gets an offline mode, but FFXI has managed to hang in there for way longer than I think most expected it too. It might be a long time.

And that's only if the mobile remake doesn't take over. Being free-to-play is really going to change the dynamic.