I wouldn't be surprised if eventually this gets extended across the border and on to the Chesapeake Bay Bridge, at least.
I believe that the last time I took US 301 through that part of Maryland, within the last several months, there were no lights between the Bay Bridge and the Delaware line. Definitely plenty of at-grade crossings, though, that it seems might become more dangerous when the new Delaware segment opens and encourages more traffic along that route.
If Maryland is going to do something to improve the 301 corridor, I'd much rather see something to improve the situation between US 50 in Bowie and the Nice Bridge. La Plata and Waldorf are infuriating. The Virginia side from the bridge to Bowling Green is still not too bad (but it does seem there's another new light every time I go that way).