I don't think there will be a agreement as long as China is still held by current government.
Although we still speak chinese. The culture already differs too much to the point that there isn't any belongingness in young people.
And thing that is more interest is. Statistically, the lower the age is, the lower the belongingness to PRC they have.
When people grows. The average belongingness will be even lower.
I think that is why PRC is so eager about that currently. 'Before everything is too late.'