It's something to keep in mind but not a big deal at the moment. Junk can't stay up in lower orbit forever. It will eventually fall out of orbit and burn up on reentry. And like any problem, there are already companies working on solution to solve the future space junk problem. Lot can be done with satellite design but even if the junk can't move on its own, Finnish company called Aurora Propulsion Technologies have small robots they're building that will clean up the space junk in lower orbit.
https://aurorapt.fi
Future of commercial space is extremely bright. You're going to see crazy amount of investments in space in the coming years. And Elon Musk and SpaceX deserves most of the credit for bringing excitement back to space and furthering our space tech. It's exciting time to be alive.