Might require you to define EOL ?
It works as well today as it did yesterday. It will be shipped with most major distros for some time (putting aside that short term Ubuntu that did ship without it a few releases ago). Debian Bullseye, the next release, and Ubuntu 20.04, due in April, both appear to have GTK2 at this stage. At some point in time, end users will need to install their own GTK2, ~200Meg, but even thats not too hard.
But I am focusing on Qt5 ....
Davo