Lets try not to argue over which youtubers are better, because all minecraft youtubers suck and they're only in it for the money for the most part ;)
I think that 100,000 is an astonishing number. That is a 20x increase of the players that are actually on the server at its peak, which is quite unreasonable due to how hard it is to actually get your videos noticed nowadays. 30,000 seems a reasonable amount, but i seriously doubt that anybody will even get that many as it's just minecraft, and all the good minecraft video ideas have been done already. Still, i have a pvr and an editing software, and i am getting a new pc soon so i might try and get those subs ;)