For me, the content created by communities that is exclusively available on that site is really helpful to me. If possible I would definitely try and archive a few subreddits and write something to search and access it offline (sorta like https://en.wikipedia.org/wiki/Kiwix but for reddit).
I see so many paralles to Twitter mass migration to Mastodon. For most people with a huge follower base they didn’t want to migrate in the early days, just because the userbase was too small and everyone was still at Twitter.
If reddit goes back to normal (which i personally hope is not too soon, This blackout hopefully has some impac) and the majority of people still post at reddit, I guess then you’d be restricting yourself (yeah FOMO is a real thing ;)) not at least reading the subreddits… Lets see how things evolve…
(Just checked and one of my fav subreddits extended its blackout until 18.06)