I disagree that only 2 takeovers have been successful, success on the pitch doesnt always mirror success at Boardroom level.
Villas takeover has been a boardroom success, they have backed their Managers with vast sums of money to waste in the transfer market, Cardiff, Sunderland, QPR, Liverpool and West Ham all have new owners that are willing to invest into the playing side and have also seen the commercial side of their businesses grow.
Only City and Chelsea have take the Boardroom success onto the winning trophys aspect, but when you spend almost 2bn, you kinda expect things like that.
If Moyes would have had 100m to spend on players who know where we would be now, if Martinez had a Chairman that said to him "Go out there and spend some money Bobby, heres 100m" who knows how far we could go.