Bellerin, Alaba, Alderweireld would cost £150m mate, maybe more.
I would not disagree and it is a reflection of how massively overinflated the transfer market has become. I mean Chelsea spent £250 million over 3 seasons (2003-2004, 2004-2005 and 2005-2006) on 28 players which helped win Chelsea 2 Premier League titles and a League Cup (as well as 2 Champions League SF appearances). These days though, Manchester City (assuming it spends £100 million on getting Walker and Mendy) would need to spend the same amount just to get a decent defense. Shame really...
Regardless this is the end result of City not addressing its defense problems sooner rather than later (in other words when prices where less overinflated they are now) and one might say we are already paying (literally) for the price for it already with the Walker and (if it actually happens) Mendy Transfers.
Despite this though, even if Mendy does end up alongside Walker on the starting lineup, we still need those 3 players simply because one needs strength in depth alongside quality. I mean what if Kompany gets injured (not an impossible prospect as we know to well)? What if Walker gets injured? What if Mendy get's sent off? What if we have to play 3 tough fixtures over 1 week (in 3 competitions)? And that is before one even gets to the merits of playing with a back 4 with Otamendi, Stones and Kolarov.
Last season shows how much our weak defense cost us when it comes to winning trophies and quite frankly we cannot afford to make the same mistakes next season, especially when the competition is only going to get tougher.
Just an impossible situation
In response to that point I want to raise the following points:
1: Despite FFP, there seems to be a common consensus that we can afford to spend £300 million a year on transfers.
2: There is the possibility that the club might end up with a transfer ban for the next 2 seasons. So there is a real risk that if Pep wants to get the players he needs, he is going to have to get them all during this transfer window if he wants his plans to succeed.
3: Regardless even if they don't get a transfer ban, if they don't address the issues within City's squad during this transfer then our club is going to end up falling short yet again on their targets during the course of next season and thus have to go back to the transfer window in a years time fully address this (and have to deal with even more inflated prices). While in turn spend more time in "work in progress" mode.
4: Thus what I am saying is that instead of spending £200-300 million each (summer) transfer window over the course of 3 seasons, we should be spending £600+ million (and spread the costs accounts wise over an much longer period than usual) over this transfer window to establish a squad which would not need major upgrades (and thus little if any cash over the next 3-4 transfer windows) and which will take us forward for the next 5 years (maybe more that that due to the age range of the players City are looking for). In other words spend it all now (as part of a long term strategy) rather than over the course of a few years.
So if City where do adopt this sort of plan for this transfer window, then it would be within their means (with some creative financial planning) to spend £150 million Bellerin, Alaba and Alderweireld alongside £100 million for Walker and Mendy. Unless I am mistaken of course...