I'll make this simple. Land Cruiser 200 series prices will "spike" when they become more rare. In the 1990's and early 2000's, you could find restoration candidate FJ40's for <$4000 CAD all over the place. Now, you would be lucky to find one for $10,000 CAD. That's because a lot of them just sat around rusting in someone's backyard. Now the FJ40 is a pretty rare find, yet still highly desired (at least a decent restoration candidate), so they are more expensive. The same concept applies to the 60's, 80's, 100's, and one day the 200 as well. The "Land Cruiser" badge is a bit of a cult vehicle. It will retain it's reputation as the great do-anything SUV, and when 200's become more rare, I'll bet the depreciation value will stop. However, don't expect to buy a brand new 2021 Heritage Edition and sell it for 1.5X it's sticker price. It will depreciate quickly for 5-7 years, then bottom out at 25%-40% of it's value, then increase gradually. If you want to take a leap of faith on the 200's, your best bet would be to buy rust-free 2008-2011 LC200's, put them in a time-capsule-garage, and forget about them for 15 years (don't take this as investment advice, because frankly, there are much better investments out there than vehicles).
If you are more concerned about having fun with a reliable legend, just drive one today. If you want to make money on the rarity thing, try to buy up as many 80's and 100's as you can and lock them up in said time-capsule. Those models are currently appreciating.
As an example, I bought a 2001 LX in 2010, drove it for 11 years and ~150,000km, and sold it for $6,000 more than I bought it for. Not exactly the greatest investment over 11 years, but it made driving the rig more like a deposit.