Under normal circumstances it'll never happen because it's not a regular 1 year exclusivity deal, it's Epic being the publisher.
It's more likely to have its console versions emulated before landing on Steam. And even if Epic puts the game on Steam, Epic will still get the money.
I really don't care what launcher I have to start (funny thing, for most epic games you don't even need the launcher) and don't know what the problem is with it and really don't care though. And regarding Alan Wake 2, don't forget that Epic funded the game and made it possible for Remedy do develop it...they are also quit happy with the partnership so I guess it's a win for Remedy.
I pirated it and will buy it on sale on Steam whenever that happens.