I'd say yes, push him. In my eyes, as long as a guy can help out the company in a positive way, then they should be pushed. Obviously guys can help by putting others (Y2J), but this is in terms of younger guys.
Anyways, Alex Riley is only 32 years old. For comparison sake, Sheamus was brought up to the WWE main roster when he was 31. In those 4 years, Sheamus has won three world championships, the United States championship, King of the Ring, and the Royal Rumble. Needless to say, Alex Riley is young enough to accomplish enough in half a decade.
A-Ry has a good look. According to his wiki, he's 6ft3 and almost 240lbs. That's a pretty good size to be taken seriously and he has a good moveset to go with it. His finishers are actually pretty good and the rest of his moveset matches what he looks like.
Alex Riley can also talk. He's not the second coming of Chris Jericho or anything, but he definitely has skills on the mic. A lot of people have been pushed even though their mic skills sucked, so why can't A-Ry get pushed? We've heard him on commentary and that was good. Yes, commentary is different from talking in the ring, but people with good mic skills are usually good at commentary (CM Punk, the Miz, Titus O'Neil, etc.).
Lastly, the fans still care about Alex Riley. Sure, some of the IWC praises him, but I'm talking about your average fans too. When I was at a live event last year, the crowd went nuts when A-Ry came out and cheered for him throughout the match. I know it wasn't just me who witnessed this because other people on this site have cited the same experience but in a different city.
Oh and his theme is epic.
I really think WWE should give him a shot. He can easily end up in the upper-midcard if given the chance. WWE could use some more faces, so why not start with someone who is actually over?