Even though the trends are showing people leaving android for iPhones?Makes sense, Tim knows they aren't coming out with much new things when it comes to iPhone hardware these days and if there weren't any iMessage barriers in place a lot more people would leave for Android devices. They are basically trying to lock people in instead of coming out with fun new hardware.
I can understand not jumping on RCS but if they cared about their users they'd make an iMessage app for Android.