No worries
I’m 100% calm as well 
Don’t get me wrong, I understand what you’re sayin’, i.e. that that dino will be helpful in the future. But what I’m witnessing now is basically this:
a) I reached up to a point where I had a bunch of dinos which allowed me to have fun. This costed several hours of my life (not complaining about it, I had a lot of fun, brought me back to running, and all these things here), and a couple of months of gaming
b) at that point, I entered Sorna, and I managed to remain at Sorna (which was good, at that time it was the topmost arena)
c) then, the update, which erased from the face of my region all the dinos I needed, which was paired up with Sorna’s incubators. When I started Sorna, my Purrosaurus was maybe level 2. Now I have enough DNA to bring it to level 11. Same stuff for a bunch of other dinos, which have low attacks, uninteresting abilities, and they don’t hybridate, so, leveling them up could be done just for purposes of gaining XP and leveling up myself, which is nice, but doesn’t solve the issues I have with my current team
d) I keep fighting battles and apart from some rockstars (yesterday I fought a battle against a guy who had 8 legendaries in their party. Good for them, but I was nuked, lol), I see people with strong teams of level 20 good dinos (even common dinos, but level 20). My most advanced dinos are a Stegosaurus (level 19, then it stopped to fuse for Legends) and a Velociraptor (level 19). All the others are level 16 tops. And I see Tany at level 20-22. And Allosaurus level 20-22. Level 24 euplocephalus. Level 23 this other guy here. And I finally win a battle and get 434 Purrosaurus DNA, 220 Irritator GEN 2, 180 Sygy GEN 2, and 13 Epic Stygymoloch and I just think I’ll never go anywhere in this way. At the moment, out of my window, I have 3 reachable dinos (I can’t go hunting the whole day) and are 3 Diplocaulus.
What should I do in the end? I have coins to level up a few to higher levels, but there’s nothing around, what’s around ain’t interesting, and what comes from incubators ain’t interesting either. If I look down at guaranteed epic Monolophosaurus, I think I have a ton of Stegoceratops that I could fuse; if I look down at guaranteed Parassaurolophus, I think I could start two new hybrids based on that dino (of which I found exactly 3 specimen after the big update, and it’s a common dino). So, the temptation of just entering a few level 6 dinos in my team, and allow defeats up until I reach the arena where the interesting DNA is, is very strong (and also it’s a tiring thought, so, in the end, it’s very much likely that I’ll drop the game since it’s becoming not fun anymore and in one more I have to go back to teaching, and if it’s like last year, I won’t have a moment to breathe, hunting dinos won’t be an option). But anyway, dropping dinos to lower level arenas, if done consistently by users, will totally ruin the fun of those who are now actually struggling in those arenas.