I am sympathetic with worries about how automation will affect the job market, and I love philosophy -- but I saw no explanation in this article for why Mark Cuban believes philosophy in particular will be more valuable.
Pay, of course, is determined by supply and demand. Developers currently do well because there are more jobs than people, but that can quickly change (and is changing, albeit slowly). The most common job in America only makes up about 3-4% of the entire workforce. Even if software jobs overtake that and grow to be the most common job in existence, but 10% of the population are willing and capable of being developers (not unbelievable given the current push by the education system to turn everyone into developers), it'll trend towards being a minimum wage job.
And that's assuming that the software labour industry grows substantially from its present size. Cuban is expecting it to shrink as AI takes on more and more development tasks which, if true, will mean we will need even fewer software professionals than we need today.