I know people say this appointment would be risky, but it is less risky than keeping Solskjaer.
Potter has shown tactical aptitude and a willingness to play on the front foot, no matter who they come up against. Some people call it naïve, but that is exactly why they dominated City in the second half of the last game and why they managed to draw against Liverpool.
The thing I find promising about him is that it is pretty clear the only thing holding him back is player quality. Last season, they should have finished a lot higher than they did, but poor finishers cost them. Their finishing seems to have improved in this one, and so you are seeing a truer reflection of their performances in the table this season.
On top of his quality work at Brighton, I think people also forget he took Ostersund from tier 4 to the top league (3 promotions in 6 seasons), winning their only major title in history (7th season). He then took them into the Europa League, reaching the round of 32 and beating Arsenal in one leg. They knocked out Galatasaray in the qualifiers, drew with Athletic Bilbao in the groups. This was amazing for a team that came from the depths of nowhere.
There has also been a noticeable impact with him leaving in 2018 - they finished 8th, 5th and 6th with Potter, and were safe from relegation in each season. They have only just narrowly escaped it since he has left, and this season they are bottom of the league. This is also a good sign of the difference he made to them.