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As per Satoshi's "Peer-to-Peer Electronic Cash System": P2P is a 'prerequisite' for the system to 'enable' electronic cash.
It does not work the other way around.
But these spammers dont even care about decentralization, so boring.
The decentralization argument is bogus since it ignores Nielsen's law, Moore's law etc.
http://www.nngroup.com/articles/law-of-bandwidth/ 1MB in 2008 when Bitcoin was first announced is actually equivalent to 17 MB today. (50% compounded per year for 7 years).
Wrong, wrong and more wrong.
The 1MB limit was put in place in 2010, not 2008. Actual bitcoin network upload speed (the real bottleneck) measurements show upload bandwidth for nodes at edge of network is growing at closer to 17-25%. (This disregards data caps for total bandwidth available also).