The Gen 1 watch will likely drop at least $100 to $250 next year when the Gen 2 model is released at the same price point. That will price a still superior to the smartwatch market device more in line with the competition and broaden the customer base willing to drop about $200-300 just to check it out. By the Gen 3 watch in two years, the Gen 1 may still be around at $150 -- still a bargain -- and broaden the customer base even more.
As for having multiple watches, I completely disagree. Having multiple phones is an anomaly -- most people just have one (just ask Hilary Clinton ;-) but watches are another story -- most people have at least two, and many have entire collections. Apple is rumored to be coming out with new case materials by Fall, just in time for the holidays, which makes a lot of sense. I expect a gold clad watch priced in the $1K-2K range for those many customers who won't consider the watch because they don't wear silver jewelry or accessories, and can't afford the Edition. This will also open the door for those who love their Watches, but don't want to wear a silver watch with a gold outfit, to buy a second watch, or get it for Christmas. The fact that the watch only has an average 18 hour battery life, having a Sport watch on a charger ready to take to the gym would be an additional purchase for many. And despite the ease of changing watch bands, many will prefer to have an additional watch that they can just grab off the charger already configured with a different band when they want to mix it up. This is actual behavior by people who wear watches now. I definitely don't see people using iPhones this way.
So, no the future is bright for the Watch. Whether it is successful as even the iPad is in question, but considering the margins Apple makes on the watch, it doesn't have to be.