If Arteta gets some extra money to improve Arsenal's squad, it will be a good thing. This season, Arsenal has executed some attacking plays quite well. But sometimes their performance has not lived up to expectations. As with the match against Southampton last Sunday. And certainly a few times the defending has also been questionable from Arsenal.
I do not know if the Arsenal hierarchy will want to spend additional funds in the January transfer market, they spent quite a lot of it in the summer, and it is paying dividends now actually, but if there are a few areas that Arteta points out that he needs fresh legs, then the board might have no choice but to spend, but i'm pretty sure it won't be an excessive spending.
Having said that, Arsenal can't be perfect, as a matter of fact no football club can, they have had their disappointing moments this season, but so have all the other teams in the League, they have had the fewer disappointing periods actually because they sit top of the League and are two points clear of Manchester City, but i am pretty sure Arteta will be asking his boys for more, the have to produce more and be consistent if they are to be EPL champions by the end of the season.