It seems to me that most of the more compelling apps on these platforms will be heavily server dependent anyway (location data, etc). If that's the case, then

It seems to me that most of the more compelling apps on these platforms will be heavily server dependent anyway (location data, etc). If that's the case, then presumably a lot of the heavy lifting will be done on the back end and writing multiple front ends won't be a huge problem. (i.e. Loopt)