More than likely it will have no effect.
P1 is strong in Asia, and other non European/US countries. You might see a Credo 100, soon, for less, but it will still be more than the Hasselblad 100MP.
The video issue is not a big deal to me, as I don't see either platform ideal for a video shooter, and 4K can be had for a lot less than the Hasselblad offering. Soon the Canon 1dx MKII is shipping with 4K, sure it's not 100MP, but for video unless you want high end stills from the video 20MP is good. Plus Canon has a much more user friendly lineup for video shooters.
The main thing you hear from Video shooters, (at least the ones I know) is the LCD needs to move, not the need for 100MP for video.
Sooner than later Sony will have their own 50MP MF camera out there, and Fuji may also, so I agree the price pressure will continue for the 50MP point.
For the 1st time buyer the cost to get into a new 100MP P1 back is a lot more than Hasselblad (I totally agree and I would hate to considering that purchase), but for the current P1 users, of IQ1,2, backs, the cost is very reasonable (when you factor in the 5 year value add which is included). The photographers who made the leap to the IQ180 from the P65+ for 14K, years ago, now still have a very aggressive price point to get to the 100MP back from P1. So on that side Phase to me is very aggressive and has continued that for sometime now.
Hasselblad has a great new camera and back, and I am hoping to see a comparison soon between the 2 backs. It doesn't seem that Hasselblad has upgraded the optics, only the shutter, (I may have that wrong), but they have some very good glass on the market.
I totally applaud their decision to have 2 card slots (P1 missed that totally), and they have added a state of the art LCD, and you can capture Video with sound (P1 allows video capture, just no sound). But I am also surprised that Hasselblad did not allow for the back to be powered on a tech camera at announce. I am sure that will come sometime in the future.
The key to P1 purchase is your dealer and if you are not getting good support 100% of the time, not only for new purchases, but for your entire P1 portfolio, then something is wrong and you did pay too much.
Paul C