No, the opportunity to have a single tier stand was missed when they opted not to do it in the South Stand redevelopment. It was never going to happen in the North Stand, for reasons mentioned by supercity88 above.
I know that all fans love the yellow wall, but can anyone think of a single example of new stadia being built with a single tier on a multilevel stadium? Possible exception of the concept art for Liverpool's new stadium, for reasons that should be obvious. I've seen little to persuade me that modern architects do not consider single tier blocks of seats to be anachronistic and out of date. Stadium design seems to be all about the multi-tier bowl now.