I'm not a big fan of the Dialogue Mass, but I also keep things in perspective.
It's not the Novus Ordo. It's not single-handedly going to destroy your Faith.
If the Revolution had frozen in the 1950's, we would all be going to our local parishes and many of us would be participating in Dialogue Masses on Sundays. If we stayed home because we didn't prefer them, etc., we would be in mortal sin. It's that simple.
You can claim that Dialogue Masses, like the 62 Missal, were signposts on the way to the Novus Ordo. Maybe they are. But they are also harmless in themselves; it's hard to disagree with that.
A man can walk out his door or load a gun while committing ZERO faults, much less sins. However, if he adds JUST ONE ITEM to that -- aiming at and shooting a man -- he goes from completely guiltless to committing a heinous Mortal Sin.
Some Trads would argue that leaving your house and/or loading a gun are just as bad as the murder, "because they led to it. He couldn't have committed the murder without leaving his house, and loading that gun! Check, and mate!"
Yeah... but he also could have EASILY done those two things and remained blameless, if he hadn't actually gone a step further and shot a man.
I guess this is an example of the classic "Slippery Slope" fallacy?