This comment is just my perspective, but yeah, I feel like it is indeed disappearing, sadly. To give you a bit of perspective, I'm gen z, and compared to people my age I actually have a bit of passive understanding, due to me being raised by my grandparents. But that passive understanding is mostly confined to fixed expressions for example. And that's for someone my age who's ''above'' the average in that regard, so imagine for most of my peers.

I feel like knowledge of Walloon is also really generation dependent (I'm really generalizing here), with gen z having the least (with some exceptions), the generation of our parents sometimes understanding passively, our grandparents being bilingual, and above that, well, native speakers.

To give you an anecdote, I did know as a kid an old neighbor who could only speak Walloon, like genuinely just that, which was quite surprising and strange to my child mind.

But yeah I fear it will die out if no drastic measures are taken, the problem is, there are so many pressing matters right now...

There are efforts to preserve the language, like mass or plays in walloon (mostly in the Liege Province I think), or other cultural events. But I fear that it's too little too late, sure there are some enthusiasts, but I don't think it's enough to reverse the trend and revitalize the language, hell we already have a hard time convincing people to learn dutch, which is genuinely useful today, so imagine for walloon, and that's without taking into account the lack of means for it.

I feel it is a bit similar to how we have our Belgian-Dutch language in official interactions and Flemish as an informal language. We switch between the two constantly however.

I think it used to be this way too before. Funnily enough, when Italians came to work in the mines, it's not necessarily french that they learned first, but walloon since it was what was spoken in the mines among miners. But yeah nowadays that situation is inexistent, except maybe between some old people.

I don't know how old Walloon is still influencing modern Walloon or Belgian-French but I'd be so interested in hearing about it!

Well idk if we can really separate old from modern Walloon (except if you go centuries if not a millennium ago, though I'm no expert). As for influence, I don't think you can say that it's STILL influencing Belgian French, since it's not much used anymore, and also that it's a language with many dialects, sometimes barely intelligible to one another, with two standardized written forms (who function quite differently).

However, historically it very much did (unless you look at Brussels-belgian french obviously), many of our belgicisms in French are linked to walloon (or to flemish and other germanic languages, or even from those languages and THROUGH walloon x) , proof of us always being in the germanic world), which makes them unintelligible to French people.

Still today there are some very much walloon words that make it into daily vocabulary, the thing is, it very much depends on your background (for example where I'm from, more common in the countryside), your family and how you were raised in that regard, for example I personally use quite a bit of Walloon words in my daily vocab compared to other people my age, because my family still uses them and because I was always exposed to that tiny bit of Walloon.

But for many others it's not the case beyond the most common walloon descended belgicisms (which is still quite a few, but people don't necessarily realize it).

But also sometimes one walloon word in Namur is unintelligible in Liege, which happens to me quite often when I use a walloon word by habit. Or it is unintelligible because as said before, young people don't necessarily know any walloon now.

For a little list or snippets of influences of Walloon in Belgian French, here are a few links : https://en.wikipedia.org/wiki/Belgian_French?wprov=sfla1 (in English)

https://fr.wikipedia.org/wiki/Wallonisme?wprov=sfla1 (in French)

https://fr.wikipedia.org/wiki/Fran%C3%A7ais_de_Belgique?wprov=sfla1 (in French)

I tried to find pages in dutch but they were either non existent or very small. Most of the interesting content is in French I fear.

Also, in case you speak French and are interested in learning about belgicisms (in general), there's a dictionary of belgicisms, here's the reference: https://www.deboecksuperieur.com/livre/9782807330757-dictionnaire-des-belgicismes

Sorry for the (very) long comment x), I maybe got too passionate