1) Consoles will still have much few versions than PCs. They will probably have a new version about every 3 years with guaranteed support for 6-8 years. That'll mean that any game that comes out on that console platform during that timeframe will have to supply a version that runs on that console. Games will be changed to work on your console. You will not be required to change your console (outside of addons like VR and music peripherals) to play games.
2) There are numerous advantages due to the fact that consoles are a locked down hardware platform.
- There are fewer cheaters and hacks to give advantages in online multiplayer games.
- Use of a controller is enforced so controller users aren't at a disadvantage in online games
- No need to worry about viruses
- You are assured that in online games everyone is on an equal footing. Everybody has the same graphics settings and FPS. Even with more hardware versions existing at the same time, due to have so few of them developers will be able to specifically tune games so that the latest hardware doesn't provide an online gaming advantage.
4) Consoles are a less expensive appliance that are a no brainer purchase. Customers will know exactly what to expect for the life of the console.
5) Games for consoles will be guaranteed to work. Troubleshooting on console is the responsibility of the game creators since they are targeting a fixed hardware spec. On PCs if some is wrong there is a decent chance that is a local problem specific to that hardware/software configuration.
6) There are games that are far more popular on consoles. If you like those types of games, consoles will be the place to place them. That is especially true for online games that require a large community.
7) Though support has waned in recent years, local coop is supported more on consoles.
Generally put, consoles are easier to get and just plain work. You can walk into a store on a moments notice right now and get a PS4. You'll know the purchase of that exact product will be supported for years and you'll have to do nothing during that time to keep it that way.