The memes for OW exploded in a big way that I;ve been enjoying my G+ and tumblr stream the past couple of weeks, I;ve never seen a game rack up this many in such a short amount of time.
OT:
This is generally bound to happen when you have an exclusive vs a multiplat title, the multiplat will simply win out and garner more attention/hype because it's reaching more people. Uncharted is a 3rd person platform shooter that has a huge focus on it's singleplayer, DOOM is a game that has both it's focus on SP and MP along with Overwatch having it's focus on both casual and hardcore shooting crowds. I find it just a wee bit silly to expect an exclusive to take all platforms viewership and hype away and remain on top for months on end, it didn't happen with XCOM 2, didn't happen with anything from Xbox at the time let alone Nintendo and the same rolled along with Sony.
People still interested in those games will of course still be playing them, there is no changing that, but the hype as far as things go goes with what's multiplat and what's hot, like the flavour of the month, which changes from a month or two at a time to something else that's big and popular around the corner that everyone can play, just look at Rocket League at the time that came out, that game had a silly craze going on compared to other titles and it had it's time.
Step right up come on in, feel the buzz in your veins, I'm like an chemical electrical right into your brain and I'm the one who killed the Radio, soon you'll all see
So pay up motherfuckers you belong to "V"