First of all, PWAs are already allowed in the Play Store. It's also possible to publish PWAs in the App Store, although it's currently quite difficult to get it

First of all, PWAs are already allowed in the Play Store. It's also possible to publish PWAs in the App Store, although it's currently quite difficult to get it accepted through the review process. PWAs will go as far as service workers, and they are far from dead. Which is to say, PWAs will not live or die based on whether they can be installed via app stores.