I think minor selloffs will happen, but nothing major. As long as central bank money flows, it has to go somewhere - real estate, bonds, stamp collections, you name it. Some of it will find its way into the stock market. Of course some day we will have another crash, but there is no sign that the music is going to stop anytime soon.
I hate trying to predict too far into the future - it's a chaos theory thing - the further out into the future, the less likely it is that anything is predictable. Still, the world economic arrow is pointing to more liquidity for years to come, so I'm thinking we may be in the middle of perhaps the greatest bull market of all time.