The history of computing is full of toys that nobody would seriously try to get real work done with. The PDP was a toy. The Apple II was a toy, and so was the Mac. Unix was a toy Multics, C a toy version of Algol (thrice removed), and the Web a toy in comparison to Xanadu.
With renewed rumours of an iPad Pro, people1 are again suggesting that the iPad (and tablets in general) isn’t suitable for real work. If history is anything to go by, this is a pretty good indicator that it’s an avenue worth pursuing.