I feel sort of the same, only I've had my LR4 for over 8 years now.
Depending on what happens over the next year or so, I could see selling within 6 months or keeping it for another couple of years. Gun to my head right now, I'd probably either pick a new Defender or a used G-Wagon for my next vehicle. The Land Cruiser is a wild card. Would love to test drive one, but have a feeling there will be steep dealer premiums for the first year or two. That's a game I do not play.
Defender with the 4.4L bmw motor they're stuffing in the new range rover might be passably reliable.