Personally, I think the larger threat to the idea of cult films, is that in the age of streaming there's not as much permanence to media. Cult films of the past grew their fanbase slowly, overcoming critical or commercial failure over time.

This was often aided by a constant presence on video-store shelves, repeated TV airings and so on. But now there's a never-ending firehose of new content. Content content content! It feels like there's less room to rediscover 'old' films because 5 new ones are being released tomorrow. Many of the current generations aren't watching live TV. You're never in a position where you have to watch a 2* film from 2008 because there's nothing better on TV. The idea of not being able to watch exactly the thing you want with instant access is alien. But how else are you going to find the pleasant surprises?

And maybe that's just me being out of touch. Maybe there are new, different routes to cult classic status. I don't know.