£49.5million profit - sure the Arsenal fans would prefer to have a centre back and midfielder for that money instead of a profit.
At centre-back, there have Koscielny, Djourou, Vermaelen, Mertesacker and (the albeit poor) Squillaci. In midfield, nobody would be querying anything if Wilshere hadn't missed the entire season.
Wenger's policy is why spend omney on replacements that are only going to be temporary at best. Verlmaelen and Koscielny are top class and considerably more mobile than Dawson and King, Terry and Luiz, and Ferdinand and Vidic. Spurs have Ryan Nelson as a back-up, Chelsea have the out-of-form Cahill and United have the laughably poor Evans. Defensively, this has been the worst Premier League in years because out of the above: King, Terry, Ferdinand, Vidic and Vermaelen are relentlessly injured.
Only City really have strength in depth because they blow everybody, including Arsenal, out of the water financially.
Chelsea, City and United all are following the Leeds success model of spending beyond their means. United are safe because of their massive pulling power internationally (if not actually in Manchester) which balances out their P&L bottom line, Chelsea are looking strangely shakey and City aren't playing by the new rules.