The thing, surely, is how to actually move the case on - so that everyone involved can get some kind of justice.
Assange isn't just gonna walk out, Sweden isn't just gonna drop the case (not that anyone, bar a couple of Assange's barmier supporters like Galloway, has said they should). So what next?
I don't think interviewing him in the embassy would give him super rights. They have interviewed people abroad before, so, whilst being unusual, that isn't wholly breaking with precedent. And, as we all agree, they have said they want to arrest him and move proceedings on, then they can essentially carry out a formal interview, and will then have fulfilled all the requirements to move on. Having him return to the flats and bedrooms could indeed serve a valuable purpose, but it doesn't have to be done at the next interview, it could be done in an interview after that (as far as I understand).
Of course he would still, most likely, refuse to leave the embassy even after that, but it should be done to at least call his bluff. Likewise, you can give strong statements re-iterating Sweden's existing policy on not extraditing people for political cases, and noting that they consider wikileaks a political organisation (or something along those lines that overpriced lawyers should be able to concoct).
Again, he might refuse to move on, but then his bluff is called. I mentioned earlier how Ecuador are trying to find a way to get him out of their embassy, and I find it hard to believe they are trying to find a way that doesn't involve him going back to Sweden. And, again, I'd say that, yes, he should go back to Sweden.
The difference with Nadir, is that his defense was always wholly and completely crap, and everyone knows it now and always did. That there is at least an element of political contrivance to destroy Assange behind this case is at least plausible.
And its not about Sweden being especially likely to extradite him, its about it being much easier to extradite someone who is already locked up, and less able to defend himself. It doesn't matter that it is Sweden, it would be just as true of France, Germany, wherever.
I do agree with you that there is a nasty taste left in the mouth both those trying to portray Assange as Mr Super Who Must Be Believed, and who dismiss the case against him, and that much of that comes with a macho attitude towards women. Assange does himself no favours by not referring to getting justice for the women involved too (as well as barely mentioning Bradley Manning). But there is, imo, a clear political reason behind the pursuit of him, and that means that he does deserve some special considerations in order that he can be got back to Sweden to answer the charges fully.
Just going 'he should go back now' gets no one anywhere, even if the US and Sweden are both kinda happy for it to go on that way.