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There will always be broke people, thus there will always be renters. 27.5 years is how long the tax code allows you to depreciate the building, not the land.
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Yes, there will always be renters and in the future, there will be more renters than there are property owners. In the interim though, I expect a lot of landlords to get stiffed on their rents. Per Benjamin Roth's book,
The Great Depression: A Diary, some landlords lost their property when they couldn't meet their mortgage obligations because of deadbeat tenants. Tenants once ejected simply moved onto the next landlord to cheat.
BTW, if you're in a rent controlled area, it can take upwards to a year to eject a deadbeat tenant. This is especially true in the two SF Bay Area Workers' Paradise of San Francisco and Berkeley.
Now, back to the other question of what to do (it was asked earlier), watch this Gregory Mannarino video:
https://www.youtube.com/watch?v=YuH2P_vmnIo#t=634.