Good or Bad?
If IBM is taking the technology used in Watson, and turning it into a commercial product so as to make it more widely available, that's a good thing.
But - as the article seems to be saying - if what IBM is really doing is finding a way to get people to use more expensive mainframe CPU cycles in preference to x86 - or PowerPC - CPU cycles by making software to use Watson's techniques that outperform Hadoop's only on z/OS and not elsewhere... well, the limitation to IBM mainframes, rather than to competitively-priced IBM products, is a bad thing.
Basically, I have nothing against IBM using IBM technology to get people to buy IBM products.
However, I am dismayed that an IBM mainframe doesn't have the same price/performance as commodity x86 hardware. With a price premium, of course, reflecting the marginal cost of manufacture of the additional features that IBM mainframes do offer.
Of course, that's economic nonsense, because IBM has to amortize its costs of developing mainframe hardware... over the number of mainframes it sells. So, for IBM to get into my good books, basically it should dump the PowerPC, and start using z/Architecture compatible chips in everything... including the IBM PC Mark II, both desktops and laptops, which is intended to replace the Wintel platform as the preferred place to play Crysis and Witcher 3... well, maybe not those games, but their successors.