There are already frameworks that support lazy loading object data (e.g. Hibernate).
The other part of what you described is having the runtime do the actual unloading of the objects and replacing them with stubs to conserve memory. IMO this would be an extremely difficult problem to do well. A primitive version of this already exists at a lower level than the runtime in the form of paging/swapping.
The other part of what you described is having the runtime do the actual unloading of the objects and replacing them with stubs to conserve memory. IMO this would be an extremely difficult problem to do well. A primitive version of this already exists at a lower level than the runtime in the form of paging/swapping.