Let me compare him to a specific celebrity. In Germany we have a famous lolcow named "Drachenlord" or Rainer Winkler. His job is:
- Livestreaming, aka stare in the camera and drink some booze, talk shit because he is massively uneducated and let some copyrighted music play in the background (through his microphone) and get some "Barren" (kinda like bits) from viewers without standards.
- Let's Plays, with really shitty gameplay, boring uneducated commentary where he tries hard to be professional but obviously he is just an idiot who never left his village. But these videos
aren't even monetized.
- Sell Drachenlord-Merch. Well, not anymore. But he hasn't sold it via internet, no no no. People bought it in front of his house. Some autistic people had really driven through the country to buy his shitty merch. Btw, his adress isn't known because of this "business" but because he yelled it in a video.
His mother left him a property with a house (she is not dead, just moved away from him. And his father died). The good thing for him is that he apparently doesn't need to pay any rents. However he needs to pay electricity (and internet and water, I guess) and so he owns the electrical-company a LOT of money since he hadn't paid for years. However it's difficult for them to even get any cent because Rainer is poor. Very very poor. For years. And there is no attempt in fixing this (well, with his lack of education, skills and talent this would be impossible).
Even as a lolcow he isn't really relevant for some years now. People rather watch the compilations of "haters", he got extremely lazy and boring (at least he had some energy and tried some formats in the old days) and making fun of him got kinda stale. Hadn't heard a Drachenlord reference for quite a while.
I have no flippin idea how he creates income. He should possess no money. Maybe from his livestreams but this shouldn't be enough. But he buys tons of food, gained an impressive amount of porky weight, has money for alcohol, sometimes games, obviously pays his [bad] internet. And for all I know he gets no supportive money from the state. This guy should sit on the streets or be in prison. But no, he goes on for years without any change. And I don't know how he does that, he just does it. I am certain he shovels himself a very deep hole because all he does is procrastinate his problems away until they bite him (like the electrical-company).
So where I wanted to go with this explanation is this: Even the most irrelevant, unlikeable, most stupid "internet-celebrities" can go on for years and years and years. And Phil is certainly not that irrelevant. Nobody watches his original content but he himself is not irrelevant. So there will always be some stupid people who finance his existence or he just find other ways to make himself float, even if the whole world hates him.
The question of "how long will Phil last" is pointless.
On a side note: Even so Drachenlord is a german youtuber and his potential viewer base is much lower than Phils, on an average Rainer has more views than him. This is hilarious.