I just had an epiphany: Steelix runs over EVERYTHING in this format...except fire (and Magnezone)...
So, I found myself asking, is it worth it? I'm undecided, but I'm about to embark an a Journey to find out. I've been holding off to see the format shift, but I think I will go ahead and start testing it. I have a lot of good ideas and I'm fairly confident that Steelix will have an easy enough matchup once catcher is released. But for now, there are a few easy fixes that make this deck pretty good.
But, to answer the OP, is it viable? Very much so, as long as you can avoid fire, lol. What I mean is, not everyone one of your matchups are going to be fire (emboar). Assuming Emboar decks emcompass 40% of the field, you should win 60% of you matches with ease. Statistically speaking, its a pretty good play.