Is the i7 out in the US? Here in Spain only the m3 and i5/4/128 is out.
I'm fairly certain that it'll get ironed out. I don't remember the laws in the US, but if this doesn't get fixed, under European trade law you'd be able to return it pretty much whenever you want because it doesn't work as they advertised or the issues are too serious.
Regardless, I wouldn't bet on MS fixing something... EVER. MS or any brand! If the device is buggy from the get go, return it. If you're not in a rush, wait for it to work and then buy it. But in all honesty, it's a PC, they'll release drivers and updates... If this were a phone or Android tablet, I'd return it right away. Those things get forgotten relatively quickly. The SP4 is here to stay for a while - seeing its a full blown PC and windows will support their own hardware for a long time.