Call of Duty would suggest otherwise.
We'd 'kill' each other for sport.
Wars aren't just fought over resources. Wars are fought over who -controls- those resources. Thus, to understand wars, one has to understand how people decide if they are not one of the people with influence over the resource and how desperate they are for that resource. To understand how desperate they are for that resource - you have to understand their ideology.
Thus, wars are mostly ideological based on who we believe we are and what we believe we are entitled to.
If you want to get religious - the Bible (and many other early civilizations) speak of angels -or divine beings- who lived in perfect harmony until one of them (who was called a deceiver and accuser) prompted a war in the heavens.
Wars will not cease simply because of plenty and immortality. This is because wars are largely a conflict of ideologies and cultural identities.