So starting a YT channel is something that I will DEFINITELY be doing as soon as I start Uni (in over a year). But I won't be doing it for fame, or for fortune (though I wouldn't mind if I got those along with it haha). I'll just be making videos as a creative output for myself. Talking about my experiences in life, doing music reviews, doing some DIYs and general chats will be mainly what I do - a healthy creative output that keeps me distracted from endless essays. I certainly won't let it get too intrusive into my life - but in reality even the most demanding unis (like Oxbridge etc...) only expect 40 hr weeks from you, so you'll have plenty of time to do videos.
I also plan to upload vlogs, just so that I can remember what my Uni life was like. I'm only gonna do it once and I want some nice blog that maybe one day I can look back on.
Equally, doing videos on getting into Uni / what Uni life is like will actually be really helpful for people who aim to go one day.
I certainly wouldn't recommend copying what other YTrs do. Their content is their own. Even though they do copy each other - they know each other - so it's different. You can do the same 'tag' videos, but just mention where you got it from. Copying them isn't great because you're not really like them - you are yourself and you can't live a lie on camera forever through your entire Uni life.
A bit on Youtubers themselves: The 'pointless' stuff that PointlessBlog, MarcusButler, Danisnotonfire, AmazingPhil, Zoella etc... do isn't really 'pointless'. I mean, if it was people wouldn't watch it. I do however agree that many lose their roots. Some YTrs become unbelievably obnoxious - luckily though it's American YTrs that tend to let fame go to their head. Joey Graceffa, Shane Dawson are just two really obvious examples that easily come to mind. Even some British Youtubers i guess... to an extent.
But I don't just wanna hate on these guys. In reality, part of my annoyance is just jealously (like they do have a super awesome job), but I actually really like them. To be honest, some of them act up to the camera. Once I bumped into Joe Sugg (ThatcherJoe) and Caspar Lee in IKEA, when they getting stuff for their flat, and they were both really nice... not obnoxious at all.
Frankly, this is why I tend to watch smaller Youtubers now-a-days and people who are at Uni actually have some great channels. Not to mention, they are really thankful for every single view, every single comment, every single subscriber. I even once got an inbox thank you for subscribing. I'm sure that even the big Youtubers are grateful, but they just very rarely say it, so it makes them look super arrogant and makes us viewers feel unwanted, thus I really like bigger YTrs who still show a big appreciation for their audience (e.g. Jim Chapman).
Wow... this post has been hella long and hella off-topic.
So in short - I'd recommend it, but treat it more like a hobby and an interest, rather than an actual career or something serious. And don't hate on big Youtubers, they are, on the whole, quite nice (especially Brit ones).