Biggest problem for modern cars decades from now will likely be dealing with failing electronics that may no longer be available. It's not even like 1990s vehicles which might have simple computers to run the fuel injection and a few other items that you may be able find ways to work around. Everything is part of a tightly integrated, complex system now and it is only going to get worse.

I don't see any modern cars becoming classics. Ever.

I think some cars may become classics.  But not all.

Especially since the next 15 years are expected to be the final years of the internal combustion engine.  

"Back in my day, we use to use gasoline to power engines.  We had to deal with, oil changes every 3000-5000 miles, to make sure the engine wouldn't seize up.  And a radiator to keep the engine cool, because burning gas gets hot.  

We also had these things called transmissions with different gear ratios, to help transfer power from the gas powered engine to the wheels. Some transmissions changed gears automatically.  But if you really knew what you were doing, you can use a manual transmissions, where you changed the gears ratios yourself, all while driving the car.

And don't get me started on timing chains and timing belts."

Either some smart kids in the future will rebuild the computer systems or they’ll turn into composite cars, where the factory components will be replaced with simpler stuff. 

Some will become collectibles and fetch top dollar at auctions and elsewhere due to being the best/special of the ICE for it’s time period.  But, with so many computer modules on board it won’t be easy to replace decades from now due to planned obsolescence.  It’s not like the classics of today.  But the top dollar ones will probably sit in some rich person’s collection or museum looking pretty, so maybe won’t matter too much (as long as doesn’t impact drivability).

I’m sure that in twenty or thirty years time that somebody will take out every computer driven device out of let’s say Dodge Hellcat and update it all new computer driven devices and replace the 700 HP V8 with electric motors with equal the horse power. Mark my word on it. Although, come think about you could do the same with a Chevrolet Spark. If they don’t rust away in the next thirty years. Anything is possible.

Well, back to garage as I resto-mod a Yugo with a Fiat 500 engine and JATCO CVT. This thing will drive me to drinking

You know I think the more we watch the news the more we tend to think every regular citizen as ourselves are crying out for EV's but I call crap on that. You don't really see charging stations every where yet and even if the government wants them, that can only go so far. There will be a ton of obstacles the government and manufactures have to get around not to mention we still have millions and millions of internal combusting engines still on the road so its going to be a really long while till we get full EV's. 

Cars of today are electronic nightmares.  In the future, if you can't afford that $60000 electric model you don't even have to drive, you'll be forced onto public transportation, which is exactly where the government wants you.  I can't see any modern day vehicles becoming classics, not in their design or technology.