Though these verses are the heart of the Christmas story, they aren't the whole story. The story of the birth of Jesus includes more than the important subject of salvation and forgiveness, which are given to those who believe in Him as their Savior. The story of His birth reaches far into the future, and includes something that is still future. How far off in the future, we do not know, and it is not good to dogmatically guess at it.
But what we Christians should eagerly anticipate to come before the restoration of Israel, and the reign of Jesus as King, is the return of Jesus to take Christians to be with himself. This is what we call the rapture of the church. It is referred to in many New Testament passages, perhaps the most well-known of which is 1 Thessalonians 4:13 - 18. This could happen today. It might not happen for a long time. We don't know exactly when it will happen.
Following the church's rapture will be a 7-year period of tribulation on the earth. We read about this in Matthew 24 and elsewhere.
For those who might be new to this Biblical subject, and who would like to study it out more fully, it would be good to start by reading 2 Samuel 7:10 - 17; Isaiah 2:1 - 22; and Matthew 19:28. A good cross-reference Bible will lead you to other verses about this subject.
I suggest you get The Ryrie Study Bible.To take a look at this study Bible, click on this link: http://www.christianbook.com/kjv-ryrie-study-bible-hardcover-letter/9780802489081/pd/8908X?product_redirect=1&Ntt=8908X&item_code=&Ntk=keywords&event=ESRCP
It would also be good to read Renald Showers' book, There Really Is A Difference. To take a look at it, click on this link: http://www.foi.org/Store_ProductDetail.aspx?pid=72FFG5141ceeFegcF
Another important book to read on these themes is by John Walvoord. It is called, The Final Drama (14 Keys To Understanding The Prophetic Scriptures). To take a look at this book, click on this link: http://www.christianbook.com/final-drama-fourteen-understanding-prophetic-scriptures/john-walvoord/9780825439711/pd/3971X?product_redirect=1&Ntt=3971X&item_code=&Ntk=keywords&event=ESRCP
These books give the Biblical reasons for believing in the coming literal, earthly kingdom of Israel in which Jesus Christ reigns as King for a millennium (1,000 years).