i think the biggest problem about it is that its price goes up and down really often instead it would be better if the price would go only up 
I really hope that you're kidding. The longer and bigger the growth is, the harder the after effect is going to be once the bubble pops. Even a 1% daily growth ends up being unsustainable eventually. Regardless, I do agree that there is a little too much volatility (200-300), but it is the result of market manipulation (most likely).In the next version I think prunning method will be availible which means we will be able to use our beloved Core original wallet while not having to download the entire blockchain, only about 1GB and 1GB of past transactions should be solid and safe enough against any attacks.
Wrong. Pruning is partially implemented this version (can not be used as a wallet yet) and the minimum is 550MB, or in other words the last 288 blocks. My personal problem when using bitcoin for daily activity :
1. Some time need take so long to confirm the transaction..
2. Need global and equal fee..
3. Want to have address that i make it by my self
Problems 1-2 and connected. If you include a higher fee, there won't be a delay. Number 3 is not a problem. You can use vanitygen to generate a customized address such as I did which starts with the following "1Lauda".1. Some time need take so long to confirm the transaction..
2. Need global and equal fee..
3. Want to have address that i make it by my self
My opinion for btc problem on General basis :
1. The future of this bitcoin it self, because from what i know there was no more some kind of big advertise or promo to introducing about bitcoin to more people on different background..
2. Have not great advantage that can attract more people, product, company, etc to use bitcoin anf make it as they primary curency for transaction..
1) You can't have big advertising without someone spending a lot of money. Example: Samsung's marketing budget was $14 billion (2013) which is more than the total GDP of some countries (e.g. Iceland).1. The future of this bitcoin it self, because from what i know there was no more some kind of big advertise or promo to introducing about bitcoin to more people on different background..
2. Have not great advantage that can attract more people, product, company, etc to use bitcoin anf make it as they primary curency for transaction..
2) Bitcoin has many advantages. For example: it's decentralized; very low fees; freedom in payment; transactions are irreversible; complete control of your own money, etc.