well with flag 256 it may be 16 megs. Usually a game needs 128 megs or more, so I don't think it's a problem, when it allows fast Bloom etc.
But you're right, since it's not supported on many not so very old cards, it shouldn't be used.
In my special case it would be an option to use it if it's supported, but when it's not then simply set a screen resolution max of 1024 pixels, so the 1024 texture can be used nevertheless for the scaling tricks.
Cards that don't support 2048 textures probably don't like resolutions higher than 1024 anyway.
But you're right, since it's not supported on many not so very old cards, it shouldn't be used.
In my special case it would be an option to use it if it's supported, but when it's not then simply set a screen resolution max of 1024 pixels, so the 1024 texture can be used nevertheless for the scaling tricks.
Cards that don't support 2048 textures probably don't like resolutions higher than 1024 anyway.