I do not foresee the 2015 MacBook Air to become unsupported by macOS 10.15, but I experience some bottlenecks and issues with my current setup. In my case I run into issues with available RAM. My MacBook has only 8GB of RAM and almost consistently see RAM usage in the low to mid 90 percents. This causes the laptop to slowly load some webpages and slow loading times when switching from window to window.
Now what you should get is another question. If you simply have a lot of web browser windows and tabs open, I recommend the 16GB version of the MacBook Air. However if you use Final Cut Pro (or similar software), Logic Pro, do Photo Editing, or Program in any capacity (including HTML/CSS/JS) you should get a MacBook Pro with 32GB of RAM and however much storage you think should be sufficient in the long-time (think 3-4 years from now).
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