Nothing crazy is required for OSRS, just something to look at, which I think 2008 graphics did. The best part is that you had the option. I believe the main counter argument is that it means dev work, since I imagine some or all assets would need to be made for both types that are graphic. Unless it can be done without any development time I think that it might not pass a vote if it were done in a formal capacity. That said, I would love to be looking at 2008 or similar HD graphics instead of what we have (improved by Runelite GPU ofc) now even though it meant delayed content releases. But I know not everyone will share that opinion.