What happen if i not upgrade to new admob ?

did anyone upgrade to new admob ?

Thank you

On that page:

https://support.google.com/admob/v2/release-notes/3369520?hl=en

They’re writing:

30 September 2013: Advertising campaigns running in the legacy AdMob will stop serving ads.

But they aren’t writing if it only concerns advertisers or also developers.