It depends how rationally the market responds, I guess.
A reorg attack and a DoS are equivalent in my mind - anyone who's capable of pulling off a lengthy DoS is also capable of performing a reorg attack, whether they actually do or not is kind of irrelevant.
there is a type of reorg attack I proposed that's now been dubbed a "purge attack", that has the effect of destabalising the network by creating a window for all affected users to double spend their previously "finalised" transactions: https://medium.com/deribitofficial/destabilizing-bitcoin-con...
A reorg attack and a DoS are equivalent in my mind - anyone who's capable of pulling off a lengthy DoS is also capable of performing a reorg attack, whether they actually do or not is kind of irrelevant.