Bitcoin would never be as popular as it is right now if the price was just stable for ever. That means that you cannot use it as a investment but only a a currency. The fact that you can use it as a investment is what is attracting people.
I don't think so, if you observe well, the price of bitcoins now is just due to the demand or should I say some manipulation by the whales, if it becomes stable that means there are balance of usage on a daily basis so with that we can convince big businesses like merchants to adopt to our society and use bitcoins as a means of online transactions.
I would like the price to be stable, not too volatile. But it should also rise gradually, say, 2-5% a month.