Actually, less treaties could equate to more wars. Simply because if you have an alliance with no treaties, that alliance act's like a prick to a bunch of alliances. That alliance will get romped for it. If nobody act's like a prick, nobody pays for it. All treaties do is act as a deterrent, much like nuclear weapons do. Treaties only serve as a way to exert political power and ensure that whomever holds the most weight in the treaty web will succeed in winning the game. Simply because they will have all the major players in there pocket, and easily eliminate any would-be usurpers who seek to challenge there authority.
It makes the game far less interesting, unless you have a counter treaty-power. And I personally know that my alliance isn't playing the treaty game...