2.x Switch Default Map Preset from OpenLayers Default

Hey,

I'm interested in switching the default OpenLayers from MetaCarta to something else, like OpenStreetMap. Reasons are:

1. The MetaCarta preset uses 4326 as its projection, which is, way way way, not the standard for web maps. With the exception of some static old-school maps and a few WMS maps, it stands alone in its equiretangularity.
2. The MetaCarta preset is ugly as hell. Anti-aliasing apparently is not everywhere.
3. The MetaCarta preset doesn't have roads - zooming in just gets you big spaces of grey

There is one advantage of the MetaCarta preset:

1. It has simple licensing; everyone assumes it's public domain. This might not be true, because it's probably using OSM coastlines

And yes, it's easy to say that you can easily switch to a different preset, but how easily? And why have the default be bad? I'm afraid that end-users will assume that the ugly duckling MetaCarta map is OpenLayers, not the OpenLayers interface itself, and therefore we lose users to gmap*.

Ideas? This is a rather large change, I won't do it unilaterally.