Its Phase I would be worried about, not Hassy.
Hassy has brand recognition and a huge installed user base or experienced pro photographers it can service through their CF backs, which feed in to H series upgrades. Their H4 series are integrated cameras allowing the use of innovative technology like the HTS 1.5 tilt/shift adapter, true focus, etc. and now they have additional financial muscle through their new owners, who most certainly will not be interested in diluting the brand or losing money.
Phase / Mamiya on the other hand are a new and as yet imperfect partnership. Phase has nearly zero brand recognition outside of the small coterie of medium format users. Their current camera bodies are not up to snuff compared with the H4 series, although that may change shortly. It has some great products, but is it enough to compete successfully in the longer term against Hassy? Will Phase be around in their present form in 5 years time? I hope so, but I doubt it.