Yes, it would be great to see 100 priests and (tradionally-dressed nuns) in events like that, and that's why the TFPers became "anti-clerical". We see this in this Crisis, that there are more lay faithful who oppose the liberalization and the heresies (even percentage-wise) than priests and religious, who are in fact spreadheading this nonsense.
While it would not be enough to sway public policy, it might help some people convert. "Who are those edifying priests and nuns there? Oh, SSPX? (or whatever). I'll look into them. Maybe they're not all that bad."