You certainly can. I was a goalkeeper at a reasonable standard so just look at that position more than most others and I just think it's increasingly clear we won't get back to competing at the top end with him in goal. There are too many coincidences adding up for him not to be a problem frankly.
We've had the same issues with crosses into the box and cut backs across several managers and countless different defensive variations, we've seen defenders go away and excel with their national teams in front of different types of goalkeepers, we see the defenders calling DDG to step forward and help them out on the ball every single game, we've seen defensive performances improve immeasurably when we have used different goalkeepers over the last 5/6 years, Spain moved on from DDG because he hinders their style of football so much that they play an inferior (on paper) goalkeeper to better fit their defenders (which is what we should be doing), there are more.
He's a great shot-stopper, but you just need a lot more from a goalkeeper at the top level and he causes us too many problems given our defenders are screaming out for a dominant goalkeeper.