[reit]

>You'll need HTTP to run server code

It's better if your application is redesigned to be distributed on a fundamental level, but you can still send custom data through IPFS in a standard client/server relationship if you want to, see http://gateway.ipfs.io/ipfs/QmTkzDwWqPbnAh5YiV5VwcTLnGdwSNsN... for an example.

>I for one will not be hosting a node where arbitrary code can be run

This isn't a distributed computation platform like Ethereum, it's purely for transferring files, and the only files you host are those that you explicitly request. Also, IPFS is not a blockchain with a 51% to take over, it's an entirely different animal, the only way to redirect a site is with the correct associated public/private key (unless SHA-256 gets broken at some point in which case IPFS migrates to a different hashing algorithm).