The next generation (well, the millenials) is already starting to take over, but it probably will take three or four more cycles before they start hitting leadership positions. That’ll also be about the same time post-millennials start getting elected.
However, i wouldn't pull all eggs in the generational-change basket. The boomers were the flower-children generation, said exactly the same stuff, if you recall. Most millenials and post-millenials have huge eco-footprints and most of their efforts to reduce their footprints amount to merely window-dressing. For example cutting down on plastic bags doesn't really do jack shit when your consumption patterns are largely the same.
Generally there is a shift in attitudes, but it's not correlated to aging directly, it's related to ending up with mortgages and children, and then worrying about whether you'll be taken care of in your old age after that. If there's a divide between Boomers and Gen-X, the divide is because a lot more Gen-Xers never got married and had kids, and are much more likely to be renting rather than locked in with a mortgage. If you do some sort of economic New Deal type thing that makes things economically easier for most people, this won't
cut consumption, it will be an upwards pressure on consumption working directly against conservation efforts. So no, generational change isn't going to magically make this easier. There will still be competing pressures of trying to ensure everyone has enough, vs trying to conserve resources.
Consider that the millenials who will be in charge once they're the age of the boomers are
not going to be the same type of millenials who are at the forefront of opinion at the moment. This is the pattern you see repeated with each generation.
EDIT:
http://www.lse.ac.uk/GranthamInstitute/news/a-rich-american-household-typically-produces-more-carbon-dioxide-emissions-each-year-from-driving-than-the-entire-carbon-footprint-of-a-poor-household-over-8-months/This article points out that while rich households produce more total CO2 emissions, the CO2 emissions per dollar income are actually lower. So, income redistribution from rich to poor, while good for GDP growth, and thus the economy, is actually bad news for CO2 emissions. It should be no surprise that things that boost GDP growth are generally bad for the environment. That's not a reason not to improve income equality, but the bad news is that taxes such as a carbon tax are actually
regressive since they have more impact, percentage-wise, on a poor person's income than a rich person's.