Great article :) Lots of good research and detail in there.
Well, when you say, "No thanks, I'd like to try something new." It's surely 42 taps, but you don't really have to be polite to the bot, you could say "no" which is 2 taps...
This article feels to me like at the time of the invention of cars. I'm sure some people didn't cars replacing horses anytime soon. It's the beginning, bots will improve.
Nice article. However, on a different line of thought - a notification app will soon replace many apps.