It would be highly unlikely. Certainly it isn't the way the system is set up now. If there are systemic changes that are made, then yes, go down a different path. If you wanted to keep a defined benefit program by putting caps so that pensions could only go to a certain level, then you probably could make them sustainable.
But in terms of what's going on now, the answer is no, because the current system says I'm going to put in 10¢ a year for 35 years and I'm going to take out 70¢ a year for 35 years. There is absolutely no calculator I have ever found that shows that math works.