It's not that Riot just tossed a twister spinner on the ground, spun it, and it landed on ADC, every role needs some love at this point, and Riot seems to have a decent impression on how add variety to the choices each lane has to make.
Jungle needs some fine-tuning to get everything working the way they need it to, and it seems to be coming along fine, and ADCs have needed those item and summoner spell changes for a long time. I think the entire item system is a little screwy right now because AP itemization hasn't really been touched for a couple seasons to date, but once they change up the AP items as they did the AD and Tank items, as well as provide something for top lane to do when they aren't trying incredibly hard not to feed each other, I think the game will be in a much better place.
The problem with giving top anything to contest is that they risk overcomplicating the game, and, on top of that, top is easily the lane you can snowball the hardest if you're a couple CS up, after a kill it can be pointless to come back to lane for the person that's down a kill, so giving them something to do might be bad because whoever has the top laner with that item component finished or a kill or two is going to hands down win the fight barring some huge mistake.