Sure, Bitcoin nerds like us will play this way. But people aren't buying S.DICE based on an expectation of growth from Bitcoin nerds. They are buying it on the hopes that SatoshiDICE will receive a large influx of average Joes (of which there are many more than Bitcoin nerds) who want to gamble. These noobs cannot be expected to copy and paste bet addresses, or even run their own Satoshi client node.
In order to reach the desired parabolic growth, SatoshiDICE needs an easy to use web front end. The front end on Blockchain.info is an example of that.
We still have no decent way to estimate the impact of a domain seizure. It is claimed that a domain seizure will have negligible effect but I believe otherwise.
There is already integration with Blockchain.info. I'd imagine that's part of how Blockchain.info remains a free service.