Bitcoin will likely always have a good value, but there need to be several things considered,
1. It is not a good short term investment, yes you can make money from one year to the next or over a few years, but you stand to lose money also. Your grandchildren would be a better target for Bitcoins, as in like a Bond, let it appreciate over time, as they Mining Halves, as Mining Ends, etc. Then they sell.
2. Bitcoins were Novel, but now are Primitive or Antique, the EVM and similar additions like Graphene and Bitshares have made Bitcoin kind of like a Toy compared to useable Technologies, but the whole point was that it was the first Uncorruptible Ledger, held open by Decentralized Nodes so no one can hack them all and change it, and it allows semi-Anonymous but also trackable transactions. This likely means it will be like a Dubloon and I can actually see a Future where somehow BTC is turned into NFTs and sold at Auction based on who was arrested using them and things like that. When it all started Cold Storage and putting the Code on Solid Coins, or other Cold Storage, was popular, and we will likely see it evolve in that direction.