The issue I see with Avaloren conceptually, is that the only pitch they can go for is that it's new.
Most players have probably not read the book. One of the books is only on the PTR even. Tyr has still not been revived, so they cannot talk about whatever happened in that quest.
They would have to depend entirely on the zones being interesting brought that we should want to go there. Which is a tall ask when there are so many questlines in EK and Kalimdor that are begging to be explored.