6 months ago I would agree. I don't think I do anymore. I think "starting fresh" could actually be a great tool in our toolbox, especially as more of the world's population realizes that fiat is corrupt and more people are educated on sound money.
If your running any other type of network and it becomes so corrupted with virus, spam, spyware, etc., sometimes as a last ditch effort you just need to wipe everything and start fresh. I don't think this is anything different. The value in bitcoin doesn't come from the historical ledger. It comes from being scarce, sound, and not easily confiscation. If it becomes so corrupt, it creates a demand for a ledger that isn't corrupted. Any ledger, whether new or not, that provides a less corruptible list of transactions (ie more sound) will have more value by definition.
A brand new ledger created tomorrow, that upholds all the sound money principles bitcoin used to uphold, will be infinitely more valuable (perhaps not yet realized) than the current iteration of corecoin. It may take years, decades, or even a century for that value to be realized, but by basic definitions of money it carries more value.