I usually wouldn't dare answering this question, considering I don't know a lot about Indian history, but it is curious that today I saw a great video-documentary about Ashoka the Great (in Kings and Generals channel), and one thing I can say is that the absence of the Mauryans might have prevented (or at least) delayed the spread of Buddhism in eastern Asia as it did, something that, by itself, brings HUGE butterflies.
Also, without Chandragupta, it is very possible that the Seleucids linger in northwestern India a bit longer, and the continued presence of Hellenistic influence in the region.