speculation: 1989 will be 2019 for SPX. if not then add a few more years for money supporting stocks to run out. pump, crash, grind, then sideways forever.
This has the potential to go to near 0. You can follow the progress of Siacoin on their websites and forums. 1. Split community/Miner wars 2. Upcoming legal battles 3. Competitors - Filecoin, Storj