I don't think that it's correct to say that NASA is getting less and less funding. At least according to the data on Wikipedia, NASA's budget has been between

I don't think that it's correct to say that NASA is getting less and less funding. At least according to the data on Wikipedia, NASA's budget has been between $15B and $20B per year in inflation adjusted dollars for the last few decades, and so increasing a bit most years to account for inflation. The only budget metric that has been dropping has been NASA's percentage of the federal budget, and that's more due to the huge growth in federal spending rather than any decrease in the amount of funds that NASA has available.