Whilst I completely agree with your suggestion that away tickets should not be included (though my understanding is that the corporates are given an allocation of 10% of any away allocation and it is already the case that every single away game is hugely oversubscribed by the corporates), the club are just trying to generate profit from whatever source they can, in order to meet FFP. If the Sheik had his way, he would stick up two fingers to FFP and just spend £300m every season on new players (remember when City offered Kaka £500k per week?). I think that you will find that away tickets are not automatically included but that for the 10% allocation, the Tunnel Club members will have first shout, before they are offered to the next corporate tier below, etc, etc.
But the reality is that for every single City away game, it is very easy to buy tickets in the away end from the touts/ticket websites. For example for the Brighton away game. there are currently 50+ tickets available in the away end, on just one website. Not sure who is selling them, but I doubt it will be the corporates.
Away tickets are always going to be a very rare commodity. Fans who have been clocking up masses of points, showing amazing loyalty, are forever going to be 10%/20% below the threshold for all the major away games because of those fans who have been clocking up those points for even longer.
I was one of those long standing season ticket holders that would never have enough points to guarantee tickets for the big away games, but I was lucky enough to afford the Seasonal Hospitality packages, when they were first launched in 2010, which were the padded executive seats, no lounge but did get me on the list for away ticket waiting list. When the exec seat packages started, it was about £900 per season and included all Premier League Home games and 1 Cup home game. All CL games were extra. I did not get always get the away tickets automatically when I applied, but most of the time. I had that facility for about 5 years, then had to give it up for a couple of season, due to work taking me overseas most of the year. Coming back this season, the same package, which now includes one of the lounges is £1,800. Still have to apply for away games and am told that the corporate away allocation is now massively oversubscribed, so it is only about 10% chance of getting any away tickets.
You are totally right that from now on, only the existing long term loyal fans will get their 90% share and the 10% left will go to the corporates. For everyone stuck in the middle, it will always be the case of having to go to the black market and try your luck.