I was pretty agnostic on this before and thought guards might as well stay, and thought any moves to remove them were not worth the bother. That was before the repeated strikes by the RMT with no regard for the chaos they were causing to people's lives, and whether the strikes were even working.
Now I'm looking forward to them not being able to cause that chaos, and if DOO is the way to achieve that then so be it.
I don't really get this as an argument. If they hadn't tried to get rid of Guards, particularly in the way they did, there wouldn't have been any chaos... Well, beyond the usual chaos GTR would have got themselves into even without this dispute. For negligible benefit to the passenger, the DfT chose to start a war.
At the end of the day, there are many people who view this as the endgame, this is the hill to die on. Once the grade is gone and you've lost operational responsibility, bend over and be prepared to be shafted for the rest of your railway career, until you leave, go driving or get made redundant. Decades from now rail staff will lament that even more wasn't done to resist DOO now, like how people now lament the failure of the action in 1982.
As for "whether the strikes were even working", it'll be years before we can judge the impact across the country.