I believe basically bitcoin was designed to have huge price levels in future so it was created conceptually as an investment in initial days or as long as it is mine-able. Satoshi must have add this investment feature into bitcoin ecosystem for the reason of gaining popularity over quick time. So, investing into bitcoin must be right choice as it is in investment mode right now.
Most of the users are putting their money in bitcoins only because they feel that it can be an best investment for the future as more investors and more companies will enter into the world of bitcoins in future which will certainly take its price to new heights in coming years and we will definitely witness the same in future.
For me i believe that bitcoin will be more useful in the future since we are seen many investors came and more merchant and stores online are accepting bitcoin like steam.. and some advertising companies they are paying for their publisher for bitcoin. and other hosting and domain providers like namecheap.. they are accepting bitcoin right now and i think only amazon and ebay i do not seen that accepting bitcoin as payment,
So if those store only will accept bitcoin expect that more investors will come and the price will be affect that can give us benefits for holding bitcoin and sell them if the price is high..
If ebay and amazon starts accepting bitcoins in future then it will have a great impact on the user base as those are the most trusted sites for online shopping and most of the users prefer to shop from those sites and once they see the option of paying via bitcoins then I am sure it will attract many more people to know about bitcoins.