It really depends on what other options you have.
IMO, anyone who is bottom 20% at a T14 should be conducting a non-law permanent job search concurrent with their summer 1L internship. Many people at a T14 are the types of people (elite UG, high grades there, maybe a few years of well-paying or prestigious WE) who will have other options.
For some people, though, law school may be the only way to reasonably break into a middle-class, white-collar job out of college.
Some people just want to be a lawyer very badly. Okay. But most people who go to law school want to be a lawyer, but also value having a comfortable career.
Debt is also a factor. Luckily the T14 do not have grade stipulations (yet!). A T14 education for half-price + two more years of avoiding the real world might be worth it to some.
The problems is that the belief that law school will allow you to break into middle class is an illusion. At least half of law grads won't get jobs. They will probably never practice law. Staying in school and paying a fortune to be qualified for a job that you will never have is a huge financial mistake.
Most people in the bottom 20% should drop out now. They will have debt they can't pay for a job they will never get. I would say even the bottom 30%.
There was a thread here asking what 2Ls wished they had known before they started law school. One poster said something like " I wish I had really known how bad the employment market was. It wasn't until I was in OCI that I realized I was one interview away from having ruined my life financially." When I asked him how he didn't know that ahead of time with all the information out about employment, he said something like "I was so caught up of the excitement of being accepted and going to school, that I didn't think about it. I knew things were bad but not how bad until OCI."
Even people here who know the difficulty people without the grades or connections are going to have done advocate dropping out when it comes down to it. Very few people here will outright say, "yes, drop out, it is the best decision for you."
People still blame the student for not getting a job. The economy is the reason, the jobs don't exist.