I hope he does, he's been a great servant. He's had a couple of recent seasons where he's made some bizarre errors and been below his best, but that shouldn't overshadow how he saved our arses time and time again for several seasons prior to that.
There's always an element of rose-tinted spectacles when considering previous club greats. Schmeichel and VDS were brilliant keepers, but people only remember the good parts and talk as if they never made mistakes. They absolutely did, but in time these things fade from memory in favour of the positive.
You also have to consider the quality of the teams, and defences they played behind. Schmeichel played in a team that was massively dominant. VDS was part of the team that set a record of 14 consecutive clean sheets. In the Premier League. More than a third of a league season without conceeding a single goal! Tomasz Kuszczak played in some of those games in that run. That's how good that team was, and that defence was.
In the last few years we've had some of the worst teams it's ever been my (dis)pleasure to watch. If DDG played in the teams that either of the other did then his record would be far better.