Ask HN: Do you think there will be full replacement to Facebook?

After reading a lot about G+ fail[1], I am really interested to know, will we see full replacement to Facebook in near(10-50years) future or when someone from this community at this time will be alive when full replacement happens? (like orkut -> fb, myspace->fb,...)

[1] - https://news.ycombinator.com/item?id=9990919