I think JL can succeed in spite of BvS.
If JL scores $1.3-$1.4B at the box office and get stellear reviews, I won't be one of those who say, see BvS succeeded.
These type of box office figures are in all honestly becoming just far too ambitious, hell I'd go so far to say it's just a flat out ridiculous number to want to achieve. The reality is you can't create a perfect storm, sometimes it just happens. Zootopia crossed a billion the other day, who the hell would have predicted that? No-one. Expectations need to start coming down in terms of box office. JL at this point in time shouldn't expect anything more than what BvS got, if anything it's likely to not match it.