RDR2 will be a great sight to behold for fans of these games by R*, not so-much because of the games appeal theme-wise, indeed, many have no interest in cowboys. But the curiosity of how big and detailed things get, new mechanics, the way story gels with freeroaming and such being possible for GTA further down the line too, as for me, a huge part of why I loved RDR last time was because it was basically GTA, just different, you know?. Both futures are gonna be great to see.
The million-dollar, online, multiplayer question everyone will be asking once RDR2 releases is:
"What has Rockstar learned?"
Should be interesting.