Questions about Chromie Time

I'm a casual player and just want to play old quests for fun. I know a lot of people wouldn't recommend old quests for having fun, but I love questlines. I'd like to do this all on a single toon. With that being said, here are my questions:

1. After I reach level 50 while in Chromie Time and I'm kicked out, will I ever be able to return to Chromie Time and keep doing quests? I don't care about not getting experience or rewards.

2. If I complete all of the quests in a timeline, will I be able to replay that same timeline as many times as I want on the same toon? Again, I don't care about quest rewards.

3. Will Blizz keep adding new timelines to Chromie Time when expansions pass? Like, when the next expansion comes out, will there be a new Shadowlands timeline to explore?