I don't know how one could possibly conclude that he would definitely have made the catch. He was leaping, reaching at full extension - never an easy play even for an excellent fielder. He might've made it, but a play like that there's a pretty decent chance it doesn't cleanly hit the glove, or just pops out, going either back into play or out for a HR. I just don't see any reasonable basis for concluding the catch. That said, the interference certainly took away a good chance to make the catch, and I think if the call is interference, it should be an out, not an award of some indeterminate number of bases on the possibility he didn't make the catch. When I first saw the replay, the interference seemed clearly out of play, so I disagreed with the call. On replays, I'm not so sure. I still lean that it was out of play - the guy in the grey isn't leaning over the wall, and it looks like Betts' glove is pretty close to his body, so I think the glove is over the wall. But I think it's tough to really tell.
It's unfortunate to have a questionable call at such an important moment, but so it goes. Even with replay, some calls are just really tough to make. At any rate, Astros will be the favorite tonight, and if they get it back to Boston, we'll see what happens with Sale. As a Yankee fan, I'm not too thrilled with the possibility of Nathan Eovaldi being the ALCS MVP.
Demented and sad, but social, right?