I hope everyone realizes that what we actually know on this subject is a small fraction of the reality. Obama isn't pulling this shit out of his ass. He's highly guided in this area by some of the same people that guided the last president and will the next. This isn't an area they casually let the president change course without serious guidance. And you know when a president crosses that. That's when you start having people resign. We've seen that in the past. That's not happening here. We have no clue how advanced our tech is in this area. My guess is ICBM's will be pointless or utterly useless in a few years and I wouldn't be shocked if that's already the case.
Finally, someone writes something sensible on the subject! I'll add three things:
(a) Even if we dropped down to 300 strategic nukes we would still maintain the ability to practically annihilate life from the planet, except for roaches and some bacteria. According to publicly available information, the largest strategic warhead we have, the B83 has a yield of 1.2 megatons. 300 of those would have a combined yield of approximately 360 megatons. To put this number in perspective: those 300 bombs would be as powerful as 18,000 of the devices used in Hiroshima and Nagasaki which were in the 20 kiloton range. Even if you only have 150 of those, that's still 180 megatons, and you keep another 150 variable yield tactical devices, that still is an almost unthinkable amount of firepower
(b) If a strategic nuclear weapon is ever launched, then chances are that it won't matter if you have 300 or 3000 more...
(c) A lot of the weapons in the U.S. Arsenal are pretty old, and are due to be retired anyways. I would bet that a large percentage of that cut can be attributed to such planned withdrawals.