"Its own users have very little trust in the company"
Yet, they log in every single day to plant their crops, tell someone happy birthday, or rant about a movie they just watched.

"The sites ease-of-use is among the worst on the web"
As opposed to what? Google+? I've logged on to that thing 3 times and still can't figure out what to do exactly. I have no problem with Facebook's ease-of-use.

"The user experience doesnt translate well to smartphones and tablets"
This one blew me away. I can't tell you how many people ONLY access Facebook on their mobile devices because they don't like using it on the PC.

"Teens are jumping to other social networks now that their parents are on Facebook"
Jumping? Can you name one that has even a 1/100th of the user base Facebook does? Besides, with 800+ million users, who cares what the teens are doing anyway? They're not keeping the site going by buying credits to play any of the games.

"A lot of Facebooks stickiness is based on games from third party companies"
And? Those third party companies are going to remain on Facebook as long as Facebook has a decent market share. And, right now, and for the pretty far foreseeable future, they have the largest share, by far.

"Photo sharing is a major part of its activity, but doesnt generate revenue"
Very true. I'm not sure what the point is, though? If you're saying that it's increasing the amount of space required by Facebook servers, I'll give you that. However, storage is, by far, not even close to any financial bottlenecks.

"It has already maxed out its user base in developed countries"
I'm not sure if I agree with "maxed out," but I see your point if you're arguing future growth. Let's call the market.....saturated, shall we? The automobile is a saturated market, too. They've been truckin' along for quite a while now! Pardon the pun, by the way.

"Its highly doubtful that it will get a chance to compete in China"
And....who else will? China has, by far, the most restrictive internet policies on the planet. I don't see that as an argument for just Facebook.

"Its financials look a lot more like Yahoo than Google"
Probably. Google has put its eggs in many baskets, though. Smart strategy.

"It has to fight the natural cycle of social networks dying and being replaced"
Let's be really honest, though. The only other social network that had any traction was Myspace. So, let's not pretend there's a huge trend to go by. And, let's remember who made Myspace die in the first place. That's right. Facebook.