I'll shit on Disney any day for what they're doing the MCU right now, but I highly disagree with the idea that WB and DC are taking their time with their movies to put in extra love and care. I'd say that the number of projects that DC has announced for the DCEU and then cancelled or delayed is roughly equal to the number that they've actually been able to put out. Sheer incompetence is what has lead The Flash to an astounding 5 year delay. The Batman? Now that is taking your time with a movie to make sure it's great. Isn't a DCEU flick though.
And anyway, my point isn't that what the DCEU currently has is bad or lacking (although personally, it definitely is), it's that seemingly none of them are connected to the other movies. I say seemingly, because I wouldn't be surprised if Shazam or Black Adam make cameos in each other's movies. But yeah, as a supposed shared universe, the DCEU is worthless in that regard. At this point, that these movies belong to the same universe means as much as bubblegum stuck to the bottom of your shoe. Occasionally noticeable but easily ignored. If for some reason the MCU ended right after Infinity War, people would have been pissed. If the DCEU ended after whatever the next movie is, I think people would be more interested in what DC can do now instead of sad for what's been lost.
As someone who is pretty tired of her new position as DC's Deadpool, I'm pretty sick of her in geneal, Margot Robbie or no. But like BrawlMan said, what's the point of her continued existence in the DCEU? She's gotten over the Joker, she's gotten over getting over the Joker, and now she's even out of the suicide squad. I guess they could do her romance with Poison Ivy, but they'd be double dipping already.