Indeed it will although my collection will be complete so I'll be glad about that.
I will be stunned if the Flash does anything for me. At best it might rival Aquaman, at worst it could be on par with JL 2017/TSS but most likely just something easy to watch with the kids and point at the things we recognize.
In regards to Batleck and Flash in the movie. They are the worst versions of the character's suits that I've seen by quite a margin. I hate that Batman's suit has blue in it and the wire/frame on the side. The only redeeming things about it are what is left from the previous designs. I have nothing positive to say about the Flash costume. I'm hoping the movie will surprise me in regard to these.
Like you say, if people love what Gunn does/will do, more power to them. This starts and ends with Snyder's DC stuff for me. Plus there is only so much money and so much room. I've got a 1/6 Delorean and a collection of 1:1 scale weapons and no idea where to put them.