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Obviously, if they have a targeted input (or a few of them) to which they want to link -- then that would make sense, and they could be doing that already and manage to hide it but a full-scale Sybil attack is just not feasible IMO.
Okay, but if they wanted to target individual UTXOs every now and then, that might be feasible, right?
With that said, I am not claiming Wasabi don't/won't do any of that, I am just stating that it would be very difficult to hide a sybil attack, besides, Wasabi doesn't need any more criticism, you make chain analysis scums richer every time you use it.
From what I've heard so far, it seems to me that sybil-attacking from the coordinator side is still feasible, as long as it's not done on a massive scale.
That's a good last point, though; even if they weren't doing anything fishy, every Wasabi CoinJoin puts some extra money in blockchain analysis pockets. They might use that to fund more blockchain analysis research and development of new ways to deanonymize us.