The business side of things will churn along divorced from the content which will become ever more generic and culturally irrelevant. The users who stay on Reddit will be of the unadventurous variety, not inclined to make waves or analyze their habits.
The only thing special about Reddit now it that it became insanely popular and got its hooks into millions of people. Those who are interested in actual discussion will go elsewhere, and those who want to mindlessly doomscroll reposted memes and have ads shoved in their face will stay. That's where they belong.