[eru]

If you can support 95% of the market (with mechanical means), you can capture 95% of the market.

[varjag]

That wouldn't be 95% of market, more like 50-60%, and a strain to use even for those apt. Not everyone is an Infocom playing nerd.

[eru]

Normal people use SMS just fine all the time.

Falling back to a human operator isn't that bad either: just charge people a little bit extra to talk to a human.