You're asking a very complex question. This question can not be answered with a reason or two. There are many factors in play. Maybe Bitcoin is still too complex for some people. Besides, the majority are ignorant and closed-minded (change is hard to accept).

1. we aren't getting paid in bitcoin

2. nowhere to spend outside or even on the internet.

Fear of change I would say is the main reason, paranoia.....well that & the fact the average joe has no need to usd bitcoin. We need more exposure - how I don't know.

what you are telling is true peoples of majority are which dont want to accept the new things in life , until it becomes more famous then they will try as they dont want to risk anything, in my view after 10 years what about 2025 we can see that majority of public who uses internet for everything will start using bitcoin, as they will get more things with bitcoin.

Average people only begin to use something when it is recommended to them by people that they know and respect on a personal level.

The internet itself was distrusted for several years before its use took off and exploded to where 80% of the world is connected to the net. Bitcoin will take off in a similar matter

With the internet, email made the common everyday man begin to understand it's potential. Because email virtually promoted itself... In all the schools, and offices world wide people were talking about this free method of communication and before too long the whole world wanted in.

The blockchain has yet to find this kind of self promoting application, but once it does, bitcoin will take off exponentially

No, the price is not stable and that's one of the main reasons people avoid using BTC. If you are talking about more than a year period, the price was fluctuating from $177 to $430 per BTC. And that is not what's called stable.

devaluation

According to me, these are the major reasons why people don't use bitcoins.

1. Anonymity: The currency is anonymous and not many do prefer using a currency that isn't legally recognized.

2. Use of bitcoins: People who are new to this currency don't see any way of using this currency as it's not accepted as a payment method compared to PayPal and Debit cards. They feel it isn't worth owning bitcoins as you need to convert it by selling it for another payment method to get fiat cash.

3. Negativity: There are many news articles which claim bitcoins as a currency used for criminal activities. This makes people refrain from using it.

4. Price: It's risky to hold bitcoins as the price keeps fluctuating a lot and isn't stable.

In my opinion, what it stopping most people is that you pretty much have to buy Bitcoin in order to get some, and that does not have an apparent benefit (articles cost the same in Bitcoin, save in some sites that are not that easy to use), and you have to go through some pain only to buy them (transfers, escrows or giving personal data etc.)

More bitcoin earning opportunities (I mean more direct earning opportunities) will make it more successful.

The volatility of the price. If the price is not steady, we will not hold and use bitcoin as we do not know the purchasing power tomorrow.