I wouldn't rule out non classic, post Velious content in some form when the time comes. Or custom content. They aren't just going to let stuff die. It may be 3-4 years from now but they'll think of something (with community input I'm sure).
Putting in PoP without the hub...basically make the planes a zone in from the existing classic world or as a wizard port (like existing planes are) with custom tuned mobs/bosses/loot or something. Just thinking out loud on that one but I could see something like that happening.
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