I think it's hard to predict what's a good or a bad investment in the stock market.
Online competition when it comes to furniture (that's the main reason folks go to Ikea, they buy other things too...) has 3 disadvantages: price for shipping, delivery time, and condition of the furniture. I'm sure overstock.com and wayfair.com are compatible but Ikea could be a good investment right before the open a store in new countries.
I would buy it!