Why do people believe dany is going to mary again to win westeros, you would think two failed political marriages would sour her on the idea. I really doubt by the time dany reach westeros she will be in the mood to bargain for anything, any thoughts

I agree. I sometimes feel people are really stretching with the whole Three Mounts Must You Ride thing, when it’s not at all clear that those mounts all describe husbands. 

I really don’t see Dany marrying a Greyjoy after they try to take her dragons – I’m pretty confident that she’s going to react to that by turning Victarion into a crisp, and I don’t think she’s going to feel any less vehemently toward Euron either. 

Now, I do think that Aegon is going to offer to marry Dany, but after everything she’s been through, I don’t think Dany’s going to be in a compromising mood, especially if (as I suspect) he’s already married to Arianne and is proposing a three-way marriage. Rather, all of the textual hints toward a second dance of the dragons suggests to me that she’s going to react by claiming the Iron Throne in her own right and going straight for Aegon’s throat. 

I could see a doomed romance between her and Jon, possibly, but I don’t see them marrying and sitting the Iron Throne together.