Plans are made keeping in mind contingencies with regards to the future, however, plans need to be updated and then followed, since in this fast changing world everything changes much more quickly than what one thinks, expects and follows.
Dreams are part of life and so is imagination. It's very important not to get depressed when the future seems to be in dark. Also it's important not to get carried away with regards to future when everything in present seems to be in place.
It's always said and often repeated for quite a number of times "A Stitch In Time Saves Nine". Even in the modern times this is something, which needs to be recalled and remembered.