Even FSAA isn't a substitute for higher resolution. At some point more pixels are needed to resolve the finer details, while AA is simply masking out the high-frequency artefacts and discontinuities. I think the screen resolution should go up in tandem with the overall graphics fidelity and detail. After all, what's the point of running an old title like Q2 in UHD or QHD mode if the assets' definition is well below that point. Sure it provides cleaner details for objects in the distance, as a byproduct.
Well that's exactly the problem. Game assets are not increasing in fidelity fast enough to keep up with screen resolutions.
It's ridiculous that we still have characters with blocky heads and shoulders on our fancy 4k monitors. It just looks stupid.