Sure, it's a fantastic idea! Now where are you going to find a sucker stupid enough to heavily invest in promoting and operating a name only to either turn it back over to you or be at your mercy come renewal time?
When one rents a storefront and then moves out because the rent is too high, there is no doubt in the customers mind the the new tenant is not the same. When one buys a license to manufacture or distribute a trademarked brand they are receiving the benefit of the marketing and recognition of that brand.
The only circumstance I can think of that would justify it is if the domain name is a very strong generic/natural type-in traffic puller and its being just redirected to the renters brand name site. The renter would make no investment in promoting the domain name and would not suffer from pulling the plug at the end of the term. That's just not your typical scenario.
If someone approached me and wanted to rent a name, sure, I'd consider it. But as hard as it is to just find a buyer to make a straightforward sale of a domain name, you are making the needle even smaller in the haystack to search for a willing renter.
And don't forget the extra legal fees for contracts, the extra hassle and aggravation.