While I agree there is a certain threshold of skills below which one can't really function as a lawyer/software dev, after passing that threshold your IQ matters less.
There is the top 1% or even 0.01% of performers out there and then there is the rest of us. The difference between a software dev with an IQ of 115 or 125 doesn't sound that big to me. A lot in their careers will depend on their people skills and work ethics more so than on their IQ.
This is especially true for jobs like lawyers or even doctors, but if we go back to software development - a lot of it is quite repititive and actually favors well people with strong work ethic. Unless you work on cutting edge algorithmic computer science stuff (which isn't really software development), we all keep building classes and models and glueing libraries together; or we gain some deep knowledge in some mobile platform or even some embedded programming. Even stuff that sounds super complex to a web developer like Kernel development probably gets repititive after awhile.