I find my goal keeps changing all the time. At the moment, I am just happy to go with the flow and let DS feed for as long as he wants. Ultimately, I would love to make it to 2 years. Like you said, it seems to be getting easier the older they get because there are less feeds. We have had a sudden drop from 7-8 feeds per day to 4-5 feeds and it's so easy. I could imagine feeding forever like this, it's easy and he feeds around the same time each day. Apart from the health benefits we all know about, for me it's convenient, and I love feeding him so can't imagine weaning anytime soon.
Good luck with your decision.