Ethereum has been out for 7 months already and so far there have been no useful or popular dapps. This would mean that for most applications trustlessness is not very useful. And for those apps where it would be generally useful, such as exchanges, betting. etc, the expensive nature of gas would mean that operating on Ethereum would be cost prohibitive and they would lose to their centralized competitors. And how is Ethereum is more secure than a properly setup VPS?