That's not a thing.
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Damn near daily. Stopped playing Quickplay online but do play with some groups of ppl and ppl on my friends list
Still play, albeit a little less since rocksmith was released in the EU.
Yes, it's drop-D plus down-tune a full step, so really drop-C (at least the bass is, so I assume the guitar is as well, plus that's how I learned it on guitar before the game came out).
Not sure how updated it is, but:
List of Pro Guitar songs with *Alternative Tunings*
which has a link to a Google Spreadsheet.