Kicking that can down the road

But the budget increase has raised eyebrows among some arms-control experts. They worry that it sends a signal that the U.S. nuclear complex will be around for decades.
A major topic of debate in the review was whether to develop a new warhead, and how much refurbishing of old warheads would turn them into "new" weapons. Last year, Congress said that future "life extension programs" for warheads should be examined on a case-by-case basis and that any changes should be limited to keeping current capabilities.
Many nuclear analysts think the review will not call for any immediate changes in the package of nuclear warheads now going through the life-extension program. Rather, it will leave that open as a future option.
Stephen Young, a senior analyst for the Union of Concerned Scientists, said: "The administration will make the right choice not to develop a new nuclear warhead now, but they will leave the door open to that option, essentially kicking that can down the road. Our concern is some people will want to walk through that door very soon, when the science says it isn't required."

Please explain to me the emboldened parts.

Source : http://beta.thehindu.com/news/national/article389917.ece