What Christians Owe Marcion

I'm not expert on Marcion, so feel free to provide counter-points here, but I found this claim by Jason D. BeDuhn in The First New Testament: Marcion's Scriptural Canon to be thought-provoking (pp. 27-28):

1. Christians owe to Marcion the idea of a New Testament. It has occurred to no one before and can best be understood as originating in the context of Marcion’s rejection of an Old Testament base for Christianity.
2. Christians owe to Marcion the particular form of the New Testament. The equal standing of the letters of Paul with the memoirs of Christ’s life is something that would not be expected as sacred literature from any precedent up to that time.
3. Christian owe to Marcion the prominence of the voice of Paul in the New Testament, and consequently in subsequent Christian tradition. Many of Marcion’s contemporaries had all but forgotten Paul, or subsumed him within the broader apostolic mass.
4. Christians owe to Marcion the push towards a Christianity rooted in its own distinctive scripture, rather than in an oral tradition of interpreting Jewish scripture, or in a scriptures system of authority and practice like most Greco-Roman religions of the time.
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He also suggests that the use of the expression "New Testament" to define a corpus of authoritative Christian literature may go back to Marcion.