...but I like the idea of Mycroft not knowing that Sherlock is alive. I like the idea that in this version, only Molly (and the homeless network) know.
Of course, in order to keep 221B, someone needs to pay Sherlock's half of the rent...or all the rent, if John doesn't return...and that sort of lends more to a Mycroft-arrangement. I suppose there's a really sadistic part of me that wants Mycroft to think that his brother is dead.
In other news: I'm loving all the speculation out there about how Sherlock pulled it off.