Thats been DC's downfall for about two decades now. The MCU had a set plan and they were allowed to followed it even if it had a few dips here and there whereas DC wanted to emulate that same idea but rushed everything, making too many of the films less enjoyable, and then got scared over the negative reactions, throwing all future plans out irrespective of it's worth.
They need "someone" (and I doubt thats Gunn for me) with a 7-10 year plan of 'safe but entertaining' films to build upon and the studio needs to trust that "someone" enough to let them just do it their way without interference (ala Feige and MCU). However I will now confidently predict (you can put a £1 bet on it) that whatever the Gunn universe turns out to be, it will also be a flop and DC will have wasted another 5 years betting on the wrong horse.