And that's the key. As long as you follow an strategy with the sets you like (say, I'll buy 5 TOO by the time it reaches 2 years on the shelves or whatever), retirement talk shouldn't matter too much. The idea is to have your target amount before the thing goes, and once you really believe it is about to be retired, make the decision to try and get more if you can. The difference is that once you reach your target goal, whether you get more or not shouldn't matter. Buying more would be a positive, but failing to would not be a disaster.
As with any investment, you can make tactical deviations from these. If you believe RE will be very unique or whatever, then buy some and be comfortable with the risk.
I'm not the first to say this by any stretch of the imagination, but it's good to bring it up every so often.