In the next 5 years, most (not all) will opt for a tablet over a laptop.
You're behind on this estimate. Peak laptop sales were around 225M in 2012. In 2014, only 210M laptops were sold, vs 266M tablets.
Since then, tablet sales have continued to grow and laptop sales have continued to shrink. So we're already at the point when more tablets are being sold than laptops, and have been at this point for ~2 years. I think within the next few years, it'll become very apparent as old laptops are retired and replaced with tablets.