As time passes, the value of Bitcoin will surely increase. Because the number of Bitcoin will be less and less, there will be many reasons for it to be lost unless it is dug out, so Bitcoin will become rarer and rarer.
I'm not certain of this. the blockchain is already pretty whopping in size, and although bitcoin has proven some ability to scale, its already considered to be "first gen" technology. The number of bitcoin nodes has kind of leveled off. I think a decreasing node count would also infer its waning usefulness and ergo price; we'll see if the rapid expansion of the blockchain has anything to do with this.