Although I guess we all here hope that bitcoin price will continue to go up, especially in the long-term, I think we should be very careful talking about any guarantees - only death and taxes are certain in this world 

The short term bitcoin price is unpredictable. Not many people expect the price to rise so much in the last 4 weeks. There are many reasons behind this rise. One could be the open of the Gemini.
2-During October the 3 biggest credit companies in the world announced investments in bitcoin-related companies additionallly 13 banks formed a partnership to learn and implement blockchain technology onto the current banking system
3-Gavin Andersen lost a huge amount of credibility from core devs after that whole bullshit about block sizes.
Reasons don't come necessarily in this order.