You know obviously we all love SotM, but as far as it having the sort of wide appeal as the games you mentioned, I don’t know.
MtG has years and years of being on the market and that gives it a huge advantage. If you’re a gamer, you pretty much know about MtG, whether you play it or not. They have a horde of professional artists at their disposal to make sure that they get just a ton of cards done quickly and beautifully. SotM has only one artist.
If you ask me, SotM is clearly the superior product. I fell in love with MtG in college and fell out of love with it shortly thereafter. It has some serious issues. People willing to shell out big bucks for rare cards have inherently stronger decks than those who do not. Combos exist that are so rediculously overpowered you can literally win the game before the other player even gets a turn. In college there was a local tournoment featuring the college kids playing MtG. I played in it and was knocked out the first round. That didn’t bug me, I’m not that good, and I knew that going in. What did bug me was that even though the players were in college and thereby had not a lot of money, the winners of the tournoment were still able to construct decks that won the game in 5 turns or less. My point is that a game doesnt have to be a good game, or a balanced game, to be a popular game. And games that are extemely well made aren’t necessarily popular. Ghost Stories is one of my favorite games, it’s excellent on all levels. What’s Ghost Stories, you ask? Exactly.
Comparing SotM to Catan is another matter. I think Catan is a pretty decent game, but it owes its sucess to extremely wide appeal. Its rules are exceedingly simple, yet it has elements of your “gamer” games, like resource management, building, and trading. Even competition, area control, and screwing your opponents. Catan is wildly popular because gamers enjoy it, gamers buy it, but not only gamers play it. It’s a game you can introduce your non-gamer friends to. It’s a game you can get your roommate to play when you need another player. It’s a game you can play with your parents, and they might have a chance of understanding it. , and even liking it. SotM is not this kind of game. Its rules are not that complex, but still too involved to get a lot of nongamers interested. The superhero genre also tends to appeal to people who are gamers, and less to those who are not.
So, to answer your questions, I feel, no, no, and no. SotM is a game for gamers. People who like to play games and like the superhero genre are going to love it, but its not going to coax anyone new to the gaming table, nor does it have the sheer force of brand recognition like MtG to get otherwise wary players into it.