[ftaghn]

> Let's see how much traction Vimscript9 will get.

In practice, none. It's a wasteland. Extensions that aim to be compatible with both vim / neovim use the old vimscript, while lua has very, very significant traction in the neovim world among people who try to bring IDE like feature to vim. The amount of people willing to write extensions that only work on vim proper, which is what would happen if they used vim9script, is close to non existent.

> I would rather expect a EGCS/GCC "merger"

Or libav vs ffmpeg.