Digital images can always be scaled down and compressed for other purposes later. But data that is never captured or knowingly tossed away can never be reclaimed. If you're shooting at less than full resolution in order to have room for more pictures, consider investing in additional memory cards for your camera or a portable storage solution so you can capture the full resolution that your camera offers.
It may not seem so important now, but the future generations wishing to remember you and preserve your history will appreciate it long after you're gone.

