Just how many 3L's have offers from biglaw? I would venture a guess that its not a significant minority.
I don't know the total number of 3Ls for this current year, I just know people personally on my rotation (I'm sure there are Fall/Spring rotation people too) that have BigLaw offers. Keep in mind, the NUSL population is largely self-selecting. Unlike many other schools, BigLaw is NOT the predominant goal here. Remember that this school's reputation is built on public interest and we send 3-5x as many grads into those types of jobs than the national average. The other popular specialties here (family, personal immigration, plaintiff/union-side employment, etc) are not areas that Biglaw firms traditionally practice in. The number of 3Ls getting Biglaw offers might be lower, but so is the proportion of students who are actually seeking those kinds of jobs.
Also, the fixation on a $50K starting salary (I'm not sure if that's an official statistic someone pulled here?) does not represent what you can be making 2 or more years down the road. Most judicial clerkships, government jobs (even the prestigious federal Honors positions), and non-profit fellowships start in that range or less. A large share of our recent graduates go to these positions first because of our public interest focus and that does bring our salary stats down.
In any case, the point is that it is not impossible or a pipedream to get a Biglaw job from Northeastern if that's what you want. We don't have traditional grades, class ranking, or law review - the factors that Biglaw firms typically rely on to select students - yet NUSL Biglaw placement is typically between 10-15% of the class each year compared to 7% average amongst other Tier 2 schools. To put it into context, only the T-14 schools place 30%+ into BigLaw while the schools ranked at #15-50 average 19% of the graduating class.
I freely admit that there are better schools for those dead set on a Biglaw job. If that's your dream and you can get into a school with a significantly higher Biglaw placement rate, go for it! But if you don't have the right numbers for that high Tier 1 school, or NUSL is a better choice for you for personal or financial reasons, you wouldn't kill your dream just by coming here.