At fawiki, this was brought up multiple times. I think there is interest in incorporating it into the "In The News" section (although we have not all the articles that enwiki has in that section. The idea of a site notice that would appear on all pages was mentioned but some (including myself) are against it. For one thing, site notices can be suppressed, and that can reduce their effectiveness. For another, site notices are meant to be about short-term wikimedia-only topics and using it for general informational purposes is debatable (today we do it for a pandemic, tomorrow for an election or political purpose? or fundraising for earthquake relief? it can quickly bubble up or at least lead to lots of length discussions about valid and invalid use cases; better disallow it outright)
Lastly, analysis of data from fawiki's main page (which gets ~50K views a day) shows that taking something to the main page only increases its daily page views by about a few hundred times a day. Those pages are topic of the day (like COVID-19 pages right now) will get most of their viewership through other mechanisms, mainly Google searches. To assume that Wikipedia's "main page" is the starting page for a large group of users, or when they go to find new information, seems to be inaccurate. Spending time on improving those articles and letting search engines guide the readers to those articles seems to be a better use of time.
I realize my POV may not be popular. I feel like everyone wants to do "something" right now, and putting stuff on the main page feels like a thing that can be done and fulfill one's self of accomplishment. But honestly, I think we're searching for the key where the light is.
Respectfully,
Huji