Conceptually, could be fantastic. Especially if it has any in-built tracks that DON'T require AR. Also, 50cc, 100cc, 150cc?
I know my kids would love it. My house is just spacious enough to possibly make it work, depending on the size of the karts - particularly if the karts can smoothly handle transitions from carpet to hard surfaces and back.
At first the price-point seemed high, but then I remembered the cost of a decent RC car + all the extra gate hardware that comes as well. Honestly it doesn't seem unreasonable at that point.
I still don't plan to get it early on, but possibly for my kids' birthdays next year.