This target is moving in at least 5 different directions at once. So, i really can't say what will happen, but whatever it is, it will be huge, radical, different.
The boomers will be devastated from every direction.
And, like you have noticed, the young generations isn't stepping up, they are stepping out. They may even form an alternative economy (i hope they can) so they do not need to pay taxes.
RE: How Much Time Can We Afford? Paying For Retirement