It's a problem now because some of us may not be around, but some of us will, and we'll be close to retirement age. The rise in oil as the supply dwindles will make living more expensive naturally. The major rise in gas prices last summer hit the economy hard. Imagine gas being $7+/gallon. No cheap bus passes anymore for you.
That, and this will majorly effect our children. Since we know it's coming, if we don't find alternatives, the next generation will be left royally fucked and scrambling. But we can at least lay down the groundwork and do some research now so that they'll have a leg to stand on later. That, and if we can cut down on oil consumption now, the supply will last longer.