Just think about the way Apple typically prices things like software upgrades. It is often good to follow these less expensive upgrades to allow for lower cost in the future. That said - there's no guarantee that purchasing the $49.00 upgrade will save you anything in that future. If you had one of the applications and wanted to get the entire Studio, there is no better deal available!
It must be understood that Apple is offering to get everyone on FC Studio for a very low price and most likely for a future reason, as yet untold.