Enough flaming now, back ontopic: flashing the TSOP requires the write-protection-connection to be soldered. If that connection is not closed there is no way to manipulate the TSOP. Of course there would be other ways to disable modded xbox's, e.g. scanning for games on HDD and delete whatever it finds (dashboards as well).
But don't forget about two major points:
1) You are M$'s customer - they would not want to piss you off. They might try to secure future consoles but I doubt they will have big hits against homebrew/backup users.
2) The software need to be deployed *somehow*. Option A would be using a game: the release groups would quickly release a patch that removes the scanning/flashing part. Option B would be via Xbox Live which has two problems: not everyone is using it and the ones who use it are most likely people who actually bought the game -> don't piss off legit customers, they might just use their xbox for playing emus or whatever.
Either way, I highly doubt there will be anti-mod or anti-dash-hack measures done that way, at least none that would seriously affect the end user. Only the future can tell for sure but don't trouble yourself too much about M$ crashing your xbox...
