The question is whether one quarter a revival makes. It is easy to see how the effervescent mood in New York could quickly go flat. Stockmarkets could tumble, scaring IPO candidates off.
https://www.economist.com/news/finance-and-economics/21738897-burden-going-public-will-need-be-lightened-if-flurry-initial-public/

IPOが増えていることに続いての文ですが、
whether one quarter a revival makes　はどういう意味でしょうか？