As previously mentioned, we don’t have any plans to switch off old Blynk in the nearest future. It will continue running for a half-year or even much longer.
Yes, but it won’t be getting any updates/improvements. We may also limit an ability to register new accounts (this should only affect our Public Cloud).
Sure.
The updated server software became much more complicated to install and maintain (which is expected, taking into account all of the new features). Right now we offer “on-premises” installation of Blynk.Cloud for Enterprise customers only, and there’s no plan to open-source the full version of it in the foreseeable future.
MQTT support is in our plans. In fact, the Datastreams concept is abstracting-away the Blynk’s Virtual Pins, and that was designed exactly to support other protocols (not only MQTT).