If changing the underlying protocol will mean that any device can send or receive blynk data via an ‘open standard’ MQTT server, then yes please.
Under these conditions, it’s possible to create apps that receive data originating from a web service, and to share data outside the Blynk app.
Blynk is hands down the best app for getting and setting data on the mobile. But there are other ways one might wish to interract with the data that Blynk does not do.
In general, IoT desperately needs standards. Once they exist, efforts to leverage that standard increase, proper documentation is developed and there will be a larger user-base to share development.