Sadly this may only be one of the last steps in the hydrogen bomb era, not a first step...
Most "ultimate" weapons have a shelf life.
Take the history of the battleship for example, between WW-I and WW-II was the era of the the Naval limitation treaties which concentrated on battleships. Of course the war that finally erupted WW-II in the pacific, the nations took great advantage of the aircraft carriers, and in the atlantic, it was submarines. The battleships used during WW-II primarily came from upgraded WW-I battleships.
These types of arms limitation treaties have not be shown to prevent any historical conflicts as they just tend to lock-in the status quo (although poorly crafted treaties may cause big problems like WW-I and WW-II). You only need to start with the Hauge Convention of 1899 declaration II and how it didn't seem to affect chemical weapon usage in WW-I very much.
We may see this a sign that nations are recognizing on emminent transition to a new munitions era. We may see nations start developing a whole new class of armaments after this. MOP or MOAB style bombs or even anti-matter bombs. These new non-nuclear bombs seem to promise to be more useful in the next battle (or war on terror).
Maybe, fortunatly, we get the opportunity bypass the urge to use this generation's strategic weapons that cause massive collateral damage and concentrate on more tactical (and containable) munitions. Strategic weapons are historically only useful to prevent a country from sustaing a war effort (if you want a more "street-fight" analogy, basically a kick in the nuts). For many countries that have nuclear weapons, demoralization by "media" has replaced the need for strategic weapons. Of course there are some other countries (e.g., like North Korea, Sudan), where media influence is insufficient other strategic mechanisms may still be needed, but probably in lower amounts.
Although this might be a glimmer of hope that we may be make to the end of the hydrogen bomb era, who knows what the next era will bring us.