Don't count on that. Unless you have an algorithmic-based product your idea can't be "secured". This business plan protects you only from the copy of the exact same product, so, if someone alter this a little, you can't do anything. What is the best thing to do? Start it! By the time you have mockups, go out and test them, take feedback from potential target group, keep metrics of your protype. You don't necessarily need developer or designer to do this, take your validation. After that you can go to talks with funds in a much better position. Build-Measure-Learn. Hope this helps. :)
Although I would not wear google glasses, i believe that they are "preparing the ground" for upcoming, better products (that won't be necessarily only glasses). Additionally, there are some niche markets that will adopt feats of the glass quite soon.
So no, Google Glasses are not that good , but yes there is potential that may lead to different trends.
But Udemy has great reputation. I strongly recommend you to take a course so as to be able to form your own opinion after all.