Earlier quoted context omitted.
1. Kids care about it. Why? Because you can use iMessage via iPad without needing a phone number, and this is how lots of tweens get started with messaging. 2. Any Android users with iPhone friends trying to use iMessage for group chat cares about it. It's impossible to add Android users to an existing group chat... and any time you have a mixed iPhone + Android group chat it degrades a number of the iMessage group c…
These are fantastic points, all of which I have personally experienced as an Android user with many iPhone family members. Apple adopting RCS won't solve #1, and is unlikely to solve #2, but solving #3 is a great start, and if the Apple faithful continue to give feedback to Apple that they care about fixing #2, we might see it one day.
Another solution Google could perhaps pursue would be to license one or multiple of those to include in the default Android install, but I don't see that happening without regulatory interference.