I'm going to hate myself for making this example, bu here goes anyway. When you watch/listen to pro games they talk about knowing how a player plays and what they are going to do. This makes it easier to play against them and to counter them. You know what they are doing when they play X champ at time Y.
I think the basis of this is true about solo Que players as well. When we know that a popular strat is for a lvl 3 panth to solo dragon its up to use to stop it. Its the same as saying that we know a lee sin typically wants to start red and go to blue. We know what he is doing and we can plan around it.
Its different if you have champ A who is a 50/50 shot at doing something or maybe a 33/33/33 (if you take ganking lanes into count). Back in early season 4 or late season 3 there was a time where nunu would solo anything just because he is nunu. While it for sure warranted a nerf it became known what he was going to do. So players prepped for it. Same now with the blitz pull on buffs (well last seasons prep on that). Players started to find ways around it.
Again I really do think that dragon/baron should be buffed regardless of the consensus of whether I'm right or not on these early drags. I think that this alone would make it much more risky if Dragon had a burn that even if a jungler blocked it they would still take damage or if he reved up like towers. This would make it harder for players to do it solo early.
In addition as another person commented its now all skill shots for dragon and they are relatively easy to dodge. This makes it much easier to do too. I've seen a lvl 3 fiora solo dragon (while she almost died) because she would just dodge his attacks. If you were for sure going to get hit by him it would make a good number of these fall off quite a bit.
While I may make it sound easier than it really is if you know its coming you should be prepared. So as a jungler you take an early back and get a ward on dragon or an early ward from the support (if possible) should be put up. A ward from the mid laner in the bottom of the river can help too. There are little things that can be done. Ofc this is solo Que we are talking about so there are varying levels of competency so you can't expect this every time.