The fuck are you talking about? No one in that thread suggested removing op commands. In fact, most of the anti-modded-server opinions amounted to "let us filter them out of the search", and the rest speculated about modded in adminium spawn jails (why would you need adminium, by the way, when you could just set down a land claim flag and have a door openable with a lever or button outside?) and servers with ranks that remove abilities from lower level players, along with speculation that admins could be modded to be allowed to randomly spawn magma springs to grief people. Not one suggested removing the ability to kick/ban people.
There were scarcely any intelligent comments in the thread, yours not among them (though neither were those of the people you were flaming, if that's any consolation).
Greifing will be harder in SMP but I imagine sand suffocatrion will be the most common way.
Sand suffocation seems unlikely, because it requires an anchor block above someone who's standing still for you to suffocate them. It would be far easier to set them on fire and hit them with a sword, which would be better known as pvp, since you could do the same to them.
Honestly, I'd hope land claim flags are a server option and can be disabled, because otherwise it just takes a lot of the fun out. Sure, I don't want someone smashing my shit, but if I don't have to worry about it, there's no excitement to the game, and it's all just carebear bullshit and the same breed of vain, paranoid masturbation that creative can turn into.
The minecraft forums certainly are depressing.
Yes.
Jay, you are the only person in this thread I don't want to hit
That's just silly bullshit.