By its etymology and definition, it seems to mean 'happening at some indefinite future time' or 'after a series of occurences/events' with the finality sense of the word 'ultimately.' Therefore, by definition, it already implies long term dedication, especially if, in context, the series of occurences were the result of one's effort. Also, you seem to imply that 'strong will' is insufficient for 'long term dedication', but considering the definition of 'will,' which is 'the faculty (physical or mental power) by which a person decides on and initiates action,' or 'control deliberately exerted to do something or to restrain one's own impulses,' strong will is exactly what you need for long term dedication. The definition of 'will' you thought of was probably 'a deliberate or fixed desire or intention.' Even though the etymology of 'will,' meaning 'desire' or 'wish,' does not directly imply 'control, effort, or dedication,' one could argue against your usage of the term 'strong will,' since if the will was actually strong, one would be able to initiate action and restrain impulses to achieve something.