The major problem for the AX100 in my area is that it started shipping too late (this week!) in an "E" version (not sure if 24p, 30P is enabled aside from the usual 25p) which I guess is similar to the version on sale in Europe. When it went on sale the news about the Panasonic FZ1000 had already been out, so had the final selling price of the A7S. The fact that the A7S' price is closer to the AX100's than it is in the US market is not helping the AX100's sales one bit.
It is quite obvious at this moment that the speed of the progress from HD to 4K is faster than the transition period in both the pro and consumer markets from SD to HD in the early 2000's. Not only are the choices coming up in a very short time but the cost of adopting the new format looks to fall rapidly as well.
Selling 4K stuff into this kind of market is going to lose one a lot of money. The sole 4K cameras in my studio for the past two months are Oppo Find 7a cell phones that shoot 4K clips for a few clients and ourselves for the web. The rigs and accessories that go with these two phones cost many times the device's but are absolutely necessary to "tame" its inherent weaknesses as a camcorder. However, we just take some comfort in that these rigs are not going to become outdated too fast or cost us too much when we need to do the upgrade, maybe in the next few months?