3 pics a year starting with BvS sounds a little over ambitious, and surely the beginning of the burst of the comic bubble. If that schedule held true, then DC would be flooding the pipe, and that does no one any good.
It doesn't seem fair to say something about DC doing three-films-a-year when Marvel has released an average of 2.8 films/year over the last 11 years. Sure, Marvel's been building up the Avengers universe, but that only accounts for about a third of the movies they've released.
It may not be fair, but DC is coming into a market already dominated by "Marvel" movies. DC putting another 3 movies a year into the mix could be flooding the market and burst this little comic book movie thing we have going on. I wish them success... kinda, but not if it interferes with my ongoing MCU/Avengers movies. I am not invested in anyway for 99% of DC's characters, so almost none of these movies excite/interest me.
If the DCCU came in at the expense of the declining Spider-man franchise, and pushed F4 off the table, then great, but there are just going to be too many comic movies in one year for the trend to stay healthy.
Let's look at the proposed schedule off the top of my head.
DC:
May 2016 – Batman v Superman
July 2016 – Shazam
Xmas 2016 – Sandman
Marvel:
May 2016 - Avengers
July 2016 - Ant-Man
Fox
? ?? 2016 - X-Men: Apocalypse
Aug 2016 - Fantastic Four
Sony
? ?? 2016 - Spider-man: Sinister Six
These movies are going to cannibalize each other. It won't be healthy for the movies if none of them make any money because they all cut each other off at the knees. Captain America 2 only made it as far as it did, off word of mouth, because it has most of April all to itself. ASM2 got cut off at the knees, not just because of bad WOM, but because Godzilla and then Xmen DOFP released right after it. Of course Spider-mans monetary issue came from overspending, but it still would have made more had it not been crammed into one of the busiest months of the year.
and honestly, with a Marvel Studios backing, DC
might find themselves coming up short in the head to head battles they are setting up. BvS up against Avenger 2... same day!? Way too much build up leading into A2 for people to not go see it.
Ant-Man vs Shazam basically boils down to an MCU backed movie fresh off the heels of A2 vs another Superman like character that no one has heard of, following up BvS. The only thing I see hyping that movie over the follow-up of A2 is if The Rock is actually Shazam and BvS killed in the theater.