Praxeology Guy,

Why would the actual end users of Bitcoin (the long term and short term owners of bitcoins) who run fully verifying nodes want to change Bitcoin policy in order to make their money more vulnerable to 51% attack?

Certainly, if only one company made use of the extra nonce space, they would have an advantage. But think of it this way, if some newer ASIC optimization comes up, would you rather have a non-ASICBoosted hash rate to defend with or an ASICBoosted hash rate? Certainly, the latter, being higher will secure the Bitcoin network better against newer optimizations.