This was interesting: Mobipocket.com is no longer accepting new publisher accounts. Instead, they're pointing everyone to DTP!
So, it looks like those who don't already have an account no longer have the Mobi option for deploying books to the Kindle store (or taking advantage of Mobi, for that matter). I'll wager that Mobipocket itself will be gone or somehow absorbed/transformed in the next six months or so...
Yes, it's quite possible that Mobipocket is probably going to be changed. I forget what thread we were discussing this, but there seemed to be some problems with Mobi's software that caused problems at Amazon. Mobi is Amazon's company but it's based in France. I think Amazon is going to want more control over them. The biggest advantage to Mobi was that a publisher could distribute worldwide.
I think this is Amazon tightening their controls; something that they needed to do.