The only way Ebay will be able to stop it (now that the word is out) is to eliminate extending listings or limiting them in the revision process.
They may not let another tool do it, but you can do it manually and I was told even SAPro has a mechanism to revise several listings at a time.
So, unless Ebay makes a major change in revision possibilities, it will affect snipers (unless the sniping software goes in and updates ending dates when they refresh for bids).
I wasn't really getting into the ethics of the policy, just asking how the snipe program ascertains end dates.