I've said it before and I'm sure that I'll say it again, but Wenger wasn't really the main problem. You've never replaced David Dein.
The quality of signings since his departure has declined, as the fees and wages have risen.
Arteta may or may not be a good manager, but I've no idea how much influence he has over signings and he's got no experience at all.
Everton picked up Ancelotti and they can sign good players off the back of his reputation. Arsenal have to rely on the club alone.
Leeds have Bielsa. Leicester have Rodgers. How have Arsenal and Man Utd ended up with untested, untried ex-players?
Regarding your first point - yes, absolutely. Wenger was given too much control and given responsibility beyond his job title. This is where I blame the ownership, as they allowed him to have this stranglehold on the club, with no proper checks and balances in place. It's what happens when you have a passive owner. The consequences of something like this is long-lasting when things go wrong and they don't intervene at the right moment. Now we're reaping what we sowed...
Regarding your second point - I think Arteta is a great coach, and many people in the footballing world have given him high praise. But I don't know if he's cut out for a job as deep and as rotten as the Arsenal job. It was always a huge risk to appoint a novice, and the club have invested a lot of time and effort into him. Things can change fast in this game, though. 4 weeks ago, everyone had faith in Arteta and believed he can take us forward. But he's made a lot of mistakes, in a short period of time, without showing that he's learned from them.
We haven't managed more shots per game than any of the bottom club's across Europe's top 5 leagues. We went 8 hours of football without a goal from open play. It's our worst start to a season since 1983. These statistics are beyond awful.
Even from the start of the year, there's been a drop-off. We played Man United at the beginning of January, you could see a definite improvement in our work rate, style of play and defensive nous. We then became competitive in games and could score goals (even if that didn't translate to the right results). But now? Almost one year later and it's deja vu. It's looking like how it did before Emery got sacked - which is extremely concerning.
As I said on the Arsenal board - These players have let down 3 different managers now. I remain convinced that, until most of these freeloaders and perennial disappointments leave, any other manager we get will struggle right now beyond an initial honeymoon phase. The rebuild we require is gigantic, yet we have two rookies in charge (Edu and Arteta) overseeing it.
It's a dark place to be in and there's no immediate solutions around the corner.
