It is true that getting lots of votes on X factor doesn't necessarily translate into album sales. But how often have we seen poor voting performances turn in to great album sales?
Are there any instances of someone ending up in the bottom 2 multiple times who then went on to have a great musical career afterwards? I can't think of any off the top of my head. I could be wrong, of course. Note though that I'm not talking about someone releasing music after having a bad run in the show, but someone who released music and became successful after having a bad run on the show.
See, the reason votes don't translate to sales is simply because people don't spend on albums in the same way they spend on voting. Voting requires lifting a telephone and you don't even see the cost until the bill comes in. In many cases, the one making the vote won't even pay the bill. It is also easy and beneficial to vote multiple times.
Compare that to buying an album. You have to lay out the money up-front. It costs more than a phone vote. There is no benefit in buying multiple copies of the album. Also, you are now comparing the artist to every other artist in the business, instead of just to 11 other talent show contestants.
The reasons why votes don't translate to album sales are quite obvious. Some will, of course - but it is clear why all of them don't. But the same applies to all contestants and not just the winner. They will all fail to translate their entire voting public into album-buying customers.
Yes, it is possible they can also pick up new customers who never voted on the show, but then that can be true for any of them. The fact of the matter, though, is that we can't judge how many that will be at this stage. If it were so obvious, the people working for record companies would come to the same conclusions and we'd never see artists flop.
But we do.
The reality is that success comes down to other factors. One is if they are successfully marketed. If the marketing campaign is weak, then exposure is poor and no-one new will hear of them. The other is - what should be - the most obvious; the songs. If you get at least one outstanding song as a lead single, you are away. If you get nothing but mediocre songs, then it doesn't matter how amazing a singer you are. You just won't sell. Hence why a mediocre singer can do fantastically if they get amazing songs.
So it really isn't possible to judge whether Misha would be successful or not. The only data we have to work on that the moment is the votes. That data does not conclude that she would. It suggests that she is not popular enough with the public. Any other suggestions of "her demographic would buy her albums, but don't vote on shows like the X Factor" are pure conjecture based on anecdotal evidence (eg. I don't vote, but would buy her album, therefore there must be a large proportion of people who feel the same).
Time will tell, as more information becomes forthcoming. But for right now, the only conclusion that can be drawn is that her chances are not good. She requires investment to produce good songs and get the necessary marketing. But who will risk giving her the good stuff based on her poor voting run? That's not good business sense.
It could happen, but it is unlikely.
EDIT: that was more rambling than I intended!