In brief:
I am trying to say that panic is not a good advisor and I prefer to be an optimist. The fear that an exchange platform would close in one night is the biggest fear of a cryptocurrency trader. It has happened before, so there is a basis for this fear. We have to admit though, that every time that an exchange site is down or it is under ddos attack, there are many people willing to sell the panic to the helpless traders. I can't remember how many times they said that Polo shuts down, but Polo still exists and has a very large volume despite the problems that it is facing lately. It is in human nature to give great attention to the one person that has an unsolved issue and to ignore the hundreds of people that they are not facing any kind of issues. It is also true that almost everyday there is an exchange site that is facing a some kind of problem and people can't trade normally.
Ok, now you sold the panic. What did you buy? Attention of course. This is also in human nature and this is how the news industry works. Of course I am worried about BTC-E and of course I am worried about Polo because everybody will lose if something happen to these sites and not only the ones that have their money there. People's trust will go to zero and Bitcoin's price will fall to a very low level. And of course, if Bitcoin falls, every coin will fall.
In these situations, we should think a little bit more. The source of panic is the fact that the most of the times an exchange site belongs to one person that we don't know and one day he/she may decide to take the money and leave. What can we do? One thing we could do is to unify and build an exchange site that it would belong to many stakeholders. I know that it is difficult and I know that it would take ages to be organized, but this is just an idea. If more people sit and think on how to deal with this kind of situations, then there will be more possibilities to find a solution that will actually work.
As it concerns BTC-e, we will wait and see.