Most normal people don't quit a very rewarding job.
Look at this Graph (least mean square of his Patreons for each year ~ 15 Jan)
View attachment 1256037
If the trend continues, he gains ~420 new patreons every year. His last documented average $ per patreon was ~8$, that's an addition of 3360$ per month. How many people do you know that earns 14,000$ (before tax and Patreon share) with yearly growth of 3300$ (per month).
Many things can happen in the course of 1 year, let alone 10 years, but I'm pretty sure unless really bad thing happen, from a massive drop of support which is unlikely to a sudden death which is more unlikely if you take his young age into consideration, there's absolutely no way he's dropping the project. I believe it's not only the money he's after and I said it many times, but money is a big motivator here.
And if shit happened and he abandoned the game than it'll be a shame, but life continues.