i-watch died long before the Reuters merge. The final nail was Thomson abandoning retail products in 2001, but really, the data behind i-watch was abandoned due to a combination of internal squabbles.
The institutional data division felt that exposing the trends like that in any fashion risked the institutions and the markets from blocking said data. The fact that there were threats from some of the stodgier markets (e.g. not NASDAQ) led to a dilution of the product relatively quickly. Plus, once Thomson shut down the editorial/analyst component to the product in late 2000, the thing was pretty useless anyway.
Still, it was a indirect contributor to changing rules around posting of transactions at the markets themselves in the mid 2000s.