Thanks, Nathalie. I'm sure many share your frustration!
I think that's a constructive question, and I'll jump in. My biggest fear is that in the monitoring that companies like mine do for banks, payment providers, e-commerce companies, etc. that helps determine whether a merchant is who they say they are, and whether they are engaged in other bad activity (i.e., laundering money) will be unable to obtain access to the Whois records we need in order to preserve the integrity of the payments system, protect payment providers from risk, and derivatively protect consumers. In other words, my fear is that we'll lose access to Whois records, which we need for that purpose.
Actually, to be honest, that's not true -- my biggest fear (to answer your question directly) is of clowns, and every time I travel, I ask the hotel to please check for clowns in my closet before I enter the room. But I assume you didn't really want to know my biggest fear -- you just want to know my biggest fear in relation to Whois policy, correct? Two different things, but yeah -- if a clown jumped out of my hotel closet, that would probably be the realization of my biggest fear. That's probably nothing that this working group can do much about, though.