Will the future be like the past, an endless succession of wars and transient civilizations? Not necessarily. Most of the past was not like that. Civilization is a recent invention. A civilization with advanced technolgy but still unresolved internal conflicts can be expected to destroy itself, not to endure through further millennia.
Many of Poul Anderson's works project future wars. However, in different timelines, the Time Wardens Period and the Star Masters period seem to have resolved social conflicts and to have ended wars.
High-tech low-population futures are shown in Midsummer Century by James Blish and in October The First Is Too Late by Fred Hoyle. However:
the Birds attack Blish's Rebirth IV civilization;
Hoyle's future society remains peaceful by staying small and avoiding scientific or technological advances - in other words, they give up.