Everyone dislikes Flash, including Adobe themselves. Google is among those trying to push for change and has actively encouraged advertisers in the past to use HTML5 on its advertisement platform. Now the company has announced that the Google Display Network and DoubleClick Digital Marketing (basically everything advertised through Google's platform) will go HTML5 by January 2017. Rest in peace, Flash.
From June 30 later this year, display adverts built in flash will no longer be accepted by Google for advertising. On January 2, Google will completely disable all Flash advertisements that are already in the system. From then on we'll be experiencing (and enjoying to some degree) HTML5 adverts. If you happen to be an advertiser, the company has helpful documentation on how to update your Flash adverts.