Decline? No. But I don't agree with this seeming new strategy of theirs to buy up studio castoffs and market them decently. No matter what they say, negative critical reception absolutely matters in the long term...just ask WB/DC.
They managed to market the hell out of The Cloverfield Paradox, but they can't do that kind of thing forever. They polished that turd nicely, the next one might just land with more of a splat. Original movies are neat, but I think they should really stick with lower budget fare rather than a blockbuster disappointment like Bright. They've had well received stuff, but none of it got anything like the coverage that Bright and Cloverfield Paradox got, and that's a real shame considering the lack of quality there.
Also, with Marvel shows, I think cutting down on the number of episodes would help things. 8-10 instead of 13...less filler, more killer.