I think that putting Abomasnow up for suspect was the right decision, for now at least. It is really a nerf to Hail as a whole. The honest truth in this is that while not only Snow Cloak was dominating the metagame, BlizzSpam was as well. I mean, think about it this way. What happened to Stoutland after Hippowdon was banned? It literally disappeared because people thought that Sand was no longer viable with only Hippopotas to provide permanent Sand.
This is more of a leveling the playing field kind of issue. Chances are, if Abomasnow is banned, then people will feel that Hail as a playstyle is not as viable as it once was. At least, people will feel that Sand and Hail are on the same level, and this is where the true issue becomes apparent. Even after a nerf to its most prominent playstyle, something will be broken if it continues to dominate the metagame. The best counter to Hail would be Sand, but nobody uses that because they don't think it's viable, since Abomasnow has a lot more longevity than Hippopotas. This issue is fixed by leaving only Snover to provide permanent Hail.
I hate to say it, but the point of making Abomasnow a suspect is to create a weather-wars metagame, where Sand and Hail are on an equal playing field. If they are still the best, then more suspects will arise and possibly create that balanced metagame. If not, then it's a job well done. This will be a ban not to resolve an issue now, but to create a more balanced metagame later, better than one where either Froslass or Snow Cloak was banned.