The thing about Newcastle since the takeover is they have to look and learn and compare their growth / development against City's from 2008. City are the only peer they have to follow.
Firstly City took 3 seasons to win a trophy and also to qualify for the Champions League. During that time, City bought two sides - the first to get us to have us properly challenge to win a trophy / CL spot and then the second team to take us to the next level. So Bellemy, Robinho, Adeybayor, Bridge, Jovetic paved the way for Aguero, Yaya, Silva, Barry etc. Newcastle are still in their ''first side'' phase yet to their credit, in ''year two'', although they haven't won a trophy, they are a year ahead of City in qualifying for the CL. City only missed out right at the end for a CL spot in 2010 when losing 1-0 to Spurs in a ''CL play off game'' and although there was disappointment at the time, it was a blessing in disguise, it was too early, as Newcastle are finding out now. City failed in the first two seasons of CL group stage, finishing 3rd the first season and woefully finishing last in the 2nd. I don't think we won a game! Yet from the 3rd season onwards we have gone beyond the group stages every season
Secondly there is the manager. City's takeover inherited Mark Hughes and were very patient with him for 16 months before taking action and bringing in Mancini. Newcastle's new owners brought in Eddie Howe and clearly he has done well, but like Hughes, he isn't the man to take them to the next level as Mancini did after Hughes. The question is how long will the owners give Howe? Unlike Hughes, Howe is popular with fans and may well bring a trophy home in the League Cup this season, but that (in my opinion) would be bad for Newcastle long term because it will keep Howe in the job longer and he isn't the man to lead a serious PL or CL challenge.