As an effect of the recent Reddit blackout, the company is now surrounded by disappointed investors and community. I predict that Reddit may end up facing the same fate as Tumblr: being sold to another company. Only time will tell what the future holds for Reddit, but one thing is for sure - the protest will leave a lasting impact on the platform and its users.
I suspect the real long-term harm to Reddit is that it will have started the push for alternatives in earnest. That, combined with Twitter and now Discord going to shit, all in such a short timespan, gives me hope that enough people will see the value in the Fediverse.