Nothing crazy is required for OSRS Fire Cape, only something to look at, which I believe 2008 images did. The best part is you had the option. I think that the counter argument is that it means greater dev work, since I envision all resources or a few would need to be made for both types that are graphic. Unless it can be done procedurally without any development time included, I think that it might not pass a vote if it were done in an official capacity. That said, I'd personally love to be looking at 2008 or comparable HD images instead of what we have (enhanced by Runelite GPU ofc) now even though it meant delayed content releases. But I understand not everyone will share that opinion.
They had done it before, there are rsps people who are using it rn, there are solo developers who've completed such and plugins. It shouldn't be hard to implement. The complaining mob not wanting a change of this old way of looking can be dealt with by A toggle choice. I think having improved graphics would be very helpful, to better attract new players. Think in the long-term marketing strategy, don't be confined to the old thinking of no manpower, no tools, bunch of updates. Man I remember running home from college because I had been excited with the RuneScape HD upgrade. I'd mainscape OSRS if it had rshd.
I'm sure that 95 percent of Buy OSRS Accounts these criers haven't even tried RS3, and don't even know why, it's free for them if they have memb on os, so why don't you try it lol. All just ancient EoC and MTX despise and I receive that, at launch it sucked. Nonetheless, it's quite glossy now. And mtx stinks yes, should you would like to, but you can dismiss like 90 percent of it. All you really need out of it will be bank boosters and action bars but that's about it. As runecoins could be purchased with bonds and you can do this without wasting a penny of irl cash. There's a lot to understand with it but it does reward skill and high attention.