Right now we have a problem. Bitcoin's price is rising so fast, so high that you would be silly to spend any of them on goods and services. Yes, downright stupid. $15 in January, $60 in March, $160 in April. At this pace we're looking at well over a thousand dollars before the end of 2013. Parting with any bitcoins now is leaving a huge wad of money at the table and literally walking away.
Less consumption is less polution.
We're saving the enviroment while getting rich. We also have to work less for our money, so I don't see the problem.