OP - Not sure what the mileage is on your 4th gen, but if you've maintained it just keep driving it until the wheels fall off. That should give the market plenty of time to correct itself. Also, hopefully by then the 6th gen will be out and you can spend plenty of time researching and checking them out to help make a decision about what you want to buy in the future.

That said, if you're simply bored with the 4th gen and want something new, but want to stay within the Toyota/Lexus family, go check out the GX460. Slightly more comfortable and family friendly 4Runner. If money isn't an issue, you could always check out a Sequoia (previous gen not current) or the LX570. Much bigger vehicles but very nice.

If you can downsize, just buy a Rav4. It's hard to find one but the new Rav4 Hybrid is awesome. If you want to downsize even more, go for a Camry Hybrid.