I don't think targeting mobile for more than a few pages of lists and limited interaction is really viable at the moment. I'm not even sure it will ever be. I mean, can you imagine entering complex forms on a small phone touch screen? I must have big fingers but I cringe at the very idea...
Mobile devices, as far as I see it are very much consuming devices, not something you create much input with unless you are 14 years old and type in SMS cryptic code and believe that a tweet is the be and and all of information.
So having a simple IDE that helps creating these pages and limited screens with some easy widgets in a simple way is totally valuable I think. Having to code all this manually with the amount of tweaks this requires for various targets is not something I aspire to do personnaly. So if something like Sencha can ease the pain, and even if it is nowhere near the value of Servoy in terms of coding, why not? Not sure coding is what is needed for mobile sites. Good widgets that translates well on all devices with as little coding as possible is what I'm looking for.
But Servoy is no help in that matter. It is a very good back-end, yes, but in no way a mobile platform right now, this of course can change in the future, although if I were to say something about it, I would say that I kind of fear it as much as I anticipate it.
Smart client possibilities were already tread off for the sake of having something that more or less translates to Web client, I fear that having another kind of client could mean reducing all of them to their least common denominator... A mistake I hope Servoy will not make!