A 60% drop really wouldn't be that bad. Keep in mind that we're in the middle of summer. A movie can have bigger weekend drops and still have pretty good legs because of summer weekdays. 46M would be a 60.7% drop, which is exactly the same as CA: TFA. TDKR dropped even more, with 61.4%. Both of those were July movies as well, and both of those had multipliers between 2.7 and 2.8.
A 60% drop might not be very good, but it isn't really a cause for concern either. After the big previews and frontloaded Friday/Saturday, it has had pretty standard holds, so it looks like it could have pretty good legs after the second weekend, just like TDKR and CA: TFA. Let's not act like it's the end of the world just yet.
I was already expecting that some people would overreact if it dropped about 60%, because if you just compare a movie with other movies that were released outside of summer you might conclude that it has supbar legs. But summer = bigger weekend drops. It's what helped GotG beat Spider-Man(2002)'s multiplier even though GotG dropped 55.3% in August vs Spider-Man's 37.8% 2nd weekend drop in May.
We won't really know just how good (or bad) the legs are until after the 3rd and 4th weekends. I don't think the holds over the last few days point toward huge drops going forward. Judging a movie based solely on the percentage it drops on the seconds weekend while completely ignoring any context will give you the wrong idea most of the time. It's even been having similar holds to Ant-Man over the last few days. If it keeps following Ant-Man's day to day drops, that would get it $47M this weekend and a final total of $350M. I'm not expecting it to go quite that high in the end, but it does show that a big drop now doesn't mean big numbers are unreachable.