This is exactly what would happen, if iphones weren't so dominant already. The problem is, many people will not add "a second messaging app" just for one "green bubble" (which as an aside, is a great way to de-humanize "the others", something we humans naturally do. Robert Sapolsky's book "Behave" is phenomenal if you're interested in that). They'll just cut that person out of the group chat.
Also it's not a "good experience" for everyone, not as much as just cutting that green bubble loser out. With no green bubbles, you get to use the default messaging app. With a different app, since you can't change the default on iOS, you have to have at least two apps, and many people balk at that.
I just want to know what Android friend groups are doing to talk to that one iPhone user? I get that iPhones are more popular in the US but in Europe where Android is dominant they (supposedly) all use WhatsApp, which is also not the default messaging app.
Are Americans just too lazy to download another app?
It's not a problem for Android because every messaging app is cross platform. The only one that isn't is iMessage, so by definition this isn't a problem that exists. But also in the US, it's nearly all iPhones, so there just aren't any groups of Android users with one iPhone friend.
More I think they are just really susceptible to marketing efforts by companies like Apple who tell them that it's a bad user experience to have multiple apps, and your own personal user experience is supreme, so people adopt and believe that. And for the people who don't, you can almost guarantee they have at least one "Apple fanatic" in their circle who will preach that gospel to them routinely.
Then there's the social status symbol of "Apple" that has become a big thing in the US. The killer on top is the invasion of the social sphere, partiuclarly with younger people, where you are bullied and isolated for not having an iThingy, and you've got a perfect recipe for Apple.
At some point I think it's got to come back around, but unfortunately that time isn't looking soon as it's trending heavily in the wrong direction right now. It's so bad now that "iPhone" has come to be a generic word for "mobile phones" and "iPad" a generic for "tablet." Just a few days ago I heard someone say something like, "Oh is that an Android iPad? aren't those just cheap knock-offs?" When this is the level of thinking in most of society, it's not hard for a company like Apple to manipulate to serve their ends.
In a group of ten people in the US, you may potentially be asking nine others to install WhatsApp.
Thats ignoring that some people (like myself) have philosophical reasons not to support Meta via WhatsApp. Just like others will not install Signal since it requires them to know your phone number (at least currently).
Then try a couple APAC countries, and people will ask why you aren't using LINE.
This has been going on for decades, ever since we saw AIM/MSN/ICQ and so on divisions country-by-country. In some cases it was simply who localized their app first.
Also it's not a "good experience" for everyone, not as much as just cutting that green bubble loser out. With no green bubbles, you get to use the default messaging app. With a different app, since you can't change the default on iOS, you have to have at least two apps, and many people balk at that.