Nepotism and 'its not what you know, its who you know' is present in every single industry known to man. That is simply the way humans are.
But getting into the media is not impossible by any means, for a start 'the media' covers such an unbelievably HUGE range of possible jobs and entry routes.
If you sit there determined to only look at 'talent' roles, front of camera/mic stuff and won't entertain anything else (ditto 'BBC nothing else') then yes, you are likely to be disappointed.
But there are myriad ways in, at the bottom, for those willing to work.
There are also more opportunities to be seen and known for being good at what you do now than ever before via social media - if you know what you're doing.
Those people whose parents are famous for whatever, they may have a bit of a headstart, sometimes a bit higher up the ladder, but if they've no talent or aptitude for the work, they will not last (which isn't to say they won't make a living, but there's no talent or integrity there and their lives likely aren't quite as glittering as they'd hoped for or want others to believe!)
Look at bit closer at some of those people who gained success because of who mummy/daddy where or who a boyfriends mummy was etc... often a closer look at their CV reveals a lot of what anyone else would call failure, and a lot of re-writing history.
Or inventing stories about silver cake slices and turds...