People with dollar signs for brains have been giving interest free loans to their competition since late 2012.  Couple that with a system DESIGNED as a near zero sum game and then ask yourself "what the fuck could possibly go wrong with this scenario".

It's what humans do though, we push the boundaries, we exploit the smallest advantages, we work within systems to maximize our value.  When a system is designed to reward those with the biggest advantage (ie lowest capital cost of equipment and overhead) then we should expect those with the greatest advantage to exploit it at every turn, because we are human.

I'm not saying that there isn't some people who wouldn't exploit a system if they could.  Lots of reasons exist to not exploit something you care about, but it is naive at best to think a system such as this won't be exploited by the vast majority of people that CAN.  It's also interesting to see how many people who don't have the proper advantages try to "exploit" the system.

The current trend of "centralizing" miners in the hands of the manufacture (or large enterprise level farms) should be expected to continue unabated as their is currently no reason to NOT continue as is!

Note exploit in context could also be read as "work within a system designed to favour those with certain advantages".

Edit:  When someone figures out how Bitmain (or any company) can make MORE profits selling only to home miners and NOT by mining themselves AND selling to ANYONE with a couple satoshi's then and only then perhaps can we start to discuss true decentralization of POW mining.