Crown jewel? You must hate spell casting classes.
I get your POV, but in 5E, it doesn't take a Dispel Magic to take down concentration spells. In fact with many area spells like Web and Silence and many others being Concentration, Dispel Magic is almost out of a job. 3E was a pain because there was only one way to address the "Scry - Buff - Teleport", not because casters had that option.
I just think that with the concentration rules, WotC pulled another knee jerk reaction and went way too far in the opposite direction (kind of like when most spells in 4E lasted a round, that was really knee jerk). Not just the limited to one spell in use aspect, but the fact that concentration shows up on so many spells, and it makes the spell caster's spells lame (almost all classes, Rangers, Paladins, Druids, everyone).
From my perspective based on how many concentration spells are in the game, one of several "fixes" should be done. Damage should not negate them, or casters should be able to have more than one, or many of the spells (like Web and the especially weak Silence) that are concentration should not be concentration. It's like WotC went into a feeding frenzy on spells. Between concentration and save every round, many spells barely work at all.
Fireball, on the other hand, is somewhat stronger. Lots of love for evokers.