Did Tulsidas plagiarized Valmiki's Ramayana? Why Ramcharitamanas became more popular than Ramayana?

Had Tulsidas composed his Ramcharitmanas in modern India, he would have landed in a jail on the charge of plagiarism as his book was nothing, but a copy of Valmiki's Ramayan. Making this observation at a two-day national seminar on Dalit literature, jointly organized by the Sahitya Academy and Patna... show more Had Tulsidas composed his Ramcharitmanas in modern India, he would have landed in a jail on the charge of plagiarism as his book was nothing, but a copy of Valmiki's Ramayan.

Making this observation at a two-day national seminar on Dalit literature, jointly organized by the Sahitya Academy and Patna University (PU) Hindi department at the geology auditorium here on Sunday, JNU professor Tulsi Ram said that the orthodox Hindu society popularized Tulsidas creation because he was a Brahmin. But Valmiki's creation was ignored by the people simply because he was a Dalit.

http://timesofindia.indiatimes.com/city/...
What do you think about this claim? Does this make any sense?
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