For example, he mentions Hesiod and his Golden Age (which is analogue to the Hindu Yugas), but does not bother to investigate the source of Hesiod's knowledge himself...
Anonymous
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One pre-Socratic Greek who did visit India is Scylax: http://en.wikipedia.org/wiki/Scylax_of_Caryanda
Plato probably received some knowledge of Indian thinking via Egypt; however, the reputation of Indian thinking was not particularly awesome.
Indian thinking becomes more influential in the 3rd century BC, by virtue of the Buddhist emperor Ashoka sending Buddhist teachers to the Hellenistic area to promote the "Law of Piety."
Related: http://encyclopedia.summitlighthouse.org/index.php/Issa
"Long Pilgrimage," John Bennett.
Athena
The 9:12 to new Delhi was already booked the day Plato decided to make a trip.
Happy Hiram
Nobody in Plato's era and of his notoriety could have travelled to India and his contemporaries wouldn't have known and written about it. India was known to the Greeks.
Naguru
Whenever he planned a visit to India, there was some or the other impediments, hurdle or obstacle. Hence he could not make a visit to India.
Anonymous
Why might anybody not go somewhere? Too poor? Too old? Bad health? Fear? Political reasons? Could be many reasons.