I've never known some fans have a blindspot like De Gea. I'm not sure whether its because its hard to analyse goalkeepers (many people basically judge them off what flashy saves they can remember) or whether its simple fondness for a player who's been around a long time. Either way, I can't ever think of a bigger disconnect between how a player actually performs and how some fans perceive him.
Imagine a striker who finished the season with 5 goals, yet the fans were arguing he was the best in the league. That's basically what's happening with De Gea. He's ranked 19th out of 22 keepers at shot stopping so far this season and people are claiming he's doing well. Its bizarre.
Anyway, Sommer is not a long term solution and in previous seasons has usually been solid rather than amazing. But he's having a stonking season and he's a more natural fit for ETH's style of football.
Not sure how much we'd be paying for him, but I can't imagine we'd pay more than £5-10M for a 34 yo keeper out of contract in the summer. Given that Sommer's transfer fee + wages would probably be less than the £18M a year we pay De Gea at the mo, feels like a smart deal.