I think for many, de Gea is sort of a metaphor for the poor stewardship of the Glazers. He symbolises someone who once represented the best parts about our club and now is seen as a symbol of decay; his game-style is roughly the same as it was when he first came here. He hasn't adapted with the times, just like our club and this ownership hasn't. He is also on absurdly high wages for a keeper (the most in the world) and that is also symbolic of this ownership.
I myself definitely think it is urgent we move on from him.
People shouldn't be looking at clean-sheet stats as the main indicator of goalkeeping success; rather, the modern way of looking at it is how many goals should the keeper have conceded and how many has he actually conceded?
In de Gea's case, in the Premier League this season, he ranks in the 40th percentile for PsXG-GA (Post-shot Expected Goals minus Goals against); this is the stat I'm referring to which gives an indication of a keeper's actual performance vs expected performance with respect to goals saved from shots faced (with expected performance defined as a shot that an 'average' keeper would save). It is an aggregate stat so it represents average performance over a period of time.
As mentioned, he ranks in the 40th percentile for this stat yet a lot of this fanbase still regularly refer to his shot-stopping as elite, generally as a way to defend him. That is not borne out by the stats at all.
And for those that think these stats aren't very useful - those *same stats* are available in his famed 17-18 season and his PsXG-GA was superb there. In other words, these stats give a pretty good representation on aggregate for a keeper's performance over an extended period of time. They show he was fantastic in that season, and has regressed since then.
As for the other areas of his game, once again, these stats also tell a tale. He ranks in the 10th percentile for crosses stopped per 90, and the 21st and 44th percentile for Defensive Actions outside the Pen Area, and Average distance of defensive actions; these are the sweeping metrics.
Here are those same stats for the EPL this season:
https://fbref.com/en/players/7ba6d84e/scout/11566/David-de-Gea-Scouting-Report
And here are his stats from the 17-18 EPL season:
https://fbref.com/en/players/7ba6d84e/scout/1631/David-de-Gea-Scouting-Report
If we do get an elite keeper that is proactive with sweeping, has good box command, good distribution whilst still being decent at shot-stopping, I think the pro-de Gea types will finally understand the difference a modern keeper can bring to us.
Really they should already understand it because we can see how City, Liverpool and
Arsenal all improved after bringing in more modern-style keepers.