Only 2 of the people I regularly message use Android; nearly all of my friends and family use iPhone. Our friend group uses Messenger to accommodate the Android users and I doubt that will change just because of RCS.
This is such a strange type of assessment to me, not only of the announcement but of one's social life, I guess because it hasn't occurred to me since high school that I'd think of my social life as a static group, or what hardware platform any of them would be using to message me, unless I get a particularly blurry MMS message from someone who's always categorically been all in on iPhone. I don't at all mean to be critical of your perspective, everyone's in a different life context and that's why culture is interesting. I also do listen to Apple oriented podcasts, and presume the hosts might have a similar view to yours.
Even if I wasn't regularly meeting new people, I have a variety of long-term friends who travel in different flexible circles, and I just get messages from whoever independently on whichever platform we happen to have exchanged a message on that day. Everyone just has a black square in their pocket as far as I'm concerned; if they're recent immigrants they might use WhatsApp, some use Signal, lots just use whichever texting protocol (if it's on Android Messages it'll auto switch to RCS), some Messenger, some Instagram, some Google Chat. Off the top of my head I might be able to guess how someone would message me, but I would only know which phones only a tiny percentage of people have.
It might be a different messaging platform because of context, such as the recent exchanges I had with the same person on Steam and Instagram, but they have my number and would probably just call or text if we were meeting up.
Even if I wasn't regularly meeting new people, I have a variety of long-term friends who travel in different flexible circles, and I just get messages from whoever independently on whichever platform we happen to have exchanged a message on that day. Everyone just has a black square in their pocket as far as I'm concerned; if they're recent immigrants they might use WhatsApp, some use Signal, lots just use whichever texting protocol (if it's on Android Messages it'll auto switch to RCS), some Messenger, some Instagram, some Google Chat. Off the top of my head I might be able to guess how someone would message me, but I would only know which phones only a tiny percentage of people have.
It might be a different messaging platform because of context, such as the recent exchanges I had with the same person on Steam and Instagram, but they have my number and would probably just call or text if we were meeting up.