I think there will definitely be a market for great shape 80's in the future. Just not now. TLC charges a lot of capital for their stuff and they look great. I've seen several of their examples and while neat, they are not 'restored' per say. It would be easy for a concours judge to pick them apart while a Land Cruiser enthusiast would very much love the result. The difference between the two perspectives has me question the prices.
It is not hard to make money on a car - pull the interior, paint the wheel wells, axel / diff housings and other under pinning black, detail the exterior, replace the carpet, clean everything the eye sees in the interior - seat belt releases etc, scrub the plastic trim, replace the shift boots and knobs with new units - same for turn stalks if needed, new windshield and a careful headliner cleaning will make any car look amazing.
Then there is the mechanical. Baseline, steam clean, have everything working perfectly. This, as you well know, can be simple or it can be a nightmare. Buying right makes the difference.
So, then what do you have? A very nice looking 80 that trips a lot of triggers for an 80 fan. Is is 'restored'? Not even close. How much time and money will it take to do the above? Plenty - certainly a lot of time too. All this means you may be able to ask a small premium for the car to recover your efforts and maybe buy a nice dinner. But with so many still great examples of 80's and the somewhat better cared for (generality) LX450's I think you would have a rig that would sell more quickly than your neighbors untouched rig, but that is about it.
Give it 10 years and everything changes.