i know a lot of people are concerned because of the legacy realms and having to start fresh with the crucible, but the team confirmed it will only happen when necessary. and the legacy realms are surely a compromise so people don’t get everything “force deleted”.
i am also quite sure that seasons etc are not a thing that will happen here after 1.0.
sure, nobody can promise anything. thats just how things are during development.
i see this whole thing more like a motivation to explore all the new things fresh once the breach hits. i would not want to play the new content with my maxed characters anyways. i mean who wants to experience the story with a max lvl char and fight lvl 1 crabs with maxed gear all over again?
even the currently known areas will get new sub-areas, and loot drops also will get re-balanced, with drops now scaling with player and area lvl. so when u start fresh u will get better fitting loot, new things to explore, new ways to enchant and so on. in my book its well worth it. almost like experiencing it for the first time again. and that is a good thing (at least for me).
EDIT: and if u have more questions or concerns, thomas was so kind to answer the communities most asked questions. you can read all about it here: Answering some Frequently Asked Questions!