It depends who you believe. Apparently the new stadium is "all but complete" and is sat in storage in Wales. Now, if you look closely, you'll see the date on that article is May 2017. You can make up your own mind about the validity of those comments.
Personally, I wouldn't build a new stadium in any financial climate. The land designated for the new stadium could hold around 200 houses. If you assume a house costs £100k to build and sells for £300k, that's £40m of potential profit from building houses. On the other hand, let's say a new stadium makes £1m profit per year (which sounds wildly optimistic), it would take 40 years of stadium operations to make the same profit as building houses. Which one would you choose?