If you mean will they ever ban clubs from playing, then I would suggest that everyone is hoping they never will do that. Banning clubs should not be perceived as a "good thing", but rather that the effort made by FFP to bring clubs into line have failed. No-one wants the rules to fail (other than those who don't believe in them at all and who would not want their club banned anyway).
You might wish to reflect on the fact that UEFA published a scale of penalties ranging on the severity of the infringement, the most penal of which is exclusion. What are the other penalties to be used for if any transgression warrants exclusion?
In City's case, the club worked very hard to try to get into line and comply (You might take issue with how they tried to do this and perhaps you believe that the revenues were artificially inflated, but that's a completely seperate issue.) With the revenue figures UEFA agreed with, the club thought it had met the FFP break-even requirement. They failed because of a difference of opinion with UEFA on the interpretation of the rules regarding historical (pre FFP) player costs and what exactly could and could not be excluded. City had one view, UEFA another. Had City been allowed to exclude these costs as it had expected, they would have passed.
In these circumstances, to issue a outright ban straight off, would have been excessive. A ban must surely be for clubs who have made no effort and perhaps for repeated non-compliance?