Juve's financial position post the stadium transition, should give out some pointers as to how difficult can the short term future be in terms of cash availability. Would not be too far fetched to say that we too have suffered from the same.
Juve are lucky that all other competition in the Serie A are in equally bad shape financially, whereas during our big crunch, we have had to compete with unlimited oil money and a general period of heavy investment by foreign based owners in the league.
I am of the opinion that the board have set him targets in line with the financial constraints, and Wenger has been able to achieve them. He would have been long sent packing if he had 50-60m available to him and he would have deliberately not spent it to achieve self vindication while using Arsenal FC as a guinea pig for 8 years.