I don't have a cut and dried answer but a lot of people are calling both Mickey and Oswald "brothers".
If you want to pay homage to the Walt and Mickey statue, you can also try to incorporate "partners" into the name. Sorry I couldn't be more specific.
Well, maybe the statue could be called "Brothers", but I'm not going to call it "Brothertown"; that's just ridiculous.
My main hangup with Mickeytown (or Mickeyville, as @Twilight_Roxas thought of) is this: Mickey's name seems to indicate what TV Tropes calls an "ego-opolis": http://tvtropes.org/pmwiki/pmwiki.php/Main/Egopolis.
One reason why I thought of Mickeytown is so that it could be replicated for Disneyland Paris and given the name "Mickeyville". Like I said, the only other name I could think of that is less egotistical was Mickey's Startown, which has something of a cross between "Starland" and "Toontown".
The funny thing is, according to the article on TV Tropes about Disney theme parks, it includes "Ego-opolis" in the list of tropes: "Walt Disney himself tried to avert this. He named Disneyland after himself (or more accurately after his company) but he didn't want his image to appear anywhere in the park, and during his lifetime it didn't. It was only after his death that 'The Walt Disney Story' was installed in the Main Street Opera House, complete with a mural featuring a huge grinning portrait of Walt. More portraits, statues, etc. have been added over the years, but Walt wouldn't have wanted any of them."
That's why I went with Mickey's Startown, to maybe try and tone it down a tad.