Why We Should "Fix" the Value Of Dragon Buffs
with the current meta being rotational, i believe that the first dragon buff and the second dragon buff should be swapped, making it a more viable option early. Currently, the ideal play-style is kill bot lane, kill bot tower, and then kill mid lane (unless your enemy mid lane has a lot of wave-clear. 
) essentially forcing the enemy botlane to either go mid and stop their siege or stay bot and take tower, I Believe that dragon could be a third potential objective for teams if their jungler could shorten his jungle time with dragon (would make him feel rewarded for taking dragon instead of farming fer dayz.)
also, this would allow their botlane to recover easier than forcing them to trade gold 4 gold and constantly being behind until mid or late game. the bonus 15% damage to turrets is a 105% Turret damage bonus if the enemy has at least 7 turrets left. so while you're not getting any gold from an early dragon, you're also only getting 5% damage on a additional turret. and that's assuming you actually get the chance to siege. the 2nd buff being 8% damage bonus is only helping out your carries and doesn't really do anything until mid game teamfights anyways.
right now the counter play to rotation is rotation, and that's a difficult task to do in solo queue, yet alone low elo. this requires you to be more efficient with your xp and gold as well as staying in a group that requires siege.
the only backlash i can see from this change is the fact assassins wont get as much early damage? (at most affecting your damage by 10 early)
the dragon buff will seem more appealing this to your jungler and will require vision (at lower elos.)
this would also force alot of fight early on in high elos, making a early dragon a claculated risk of "how long until the enemy nunu shows up?" and "how long does it take to kill it?"
to wrap this up, i think it would increase the value of dragon as well as make its buffs much more threatening, making dragon smite would be more rewarding to pull off, and allowing your jungler and top lane to be more impactful on your early game to each lane (even if they do rush sated. with AP liss top)