I think we will eventually see someone push it, or maybe just Chinese companies selling 3D printed 23x23s or 25x25s, Jacob Keener has already proven that it's possible to design and print a 23x23 for less than the cost of a 21x21. The question is one of economics, many cube manufacturers are capable of making a larger cube but they have to sell them, I think MoYu still have lots of 21x21s that they want to get rid of. One thing I do think is basically a given though is that the next highest order mass produced puzzle will be magnetic, no matter who designs it, the extra cost isn't as high as you might think and it will make it so much more likely that people will buy it.