Could be, but I can’t see what attraction it has over services from DIRFT or the new Northampton site (also a SEGRO park). The latter two have direct rail connections inbound that can and are / will be served effectively and efficiently from Gateway / Felixstowe / Southampton, and also have direct northbound connections to the main freight route to Scotland. Any Caledonian bound trains from Radlett would have to head south, do a tour of north London, or possibly including a run round, before passing Northampton 3-4 hours later. They would also have roughly 2/3rds the capacity of those using Northampton, ie same cost for 2/3rds the income.
In an industry with margins so wafer thin they make an After Eight look morbidly obese, I personally can’t see how it adds up. Perhaps I‘m wrong.