I am not disagreeing with you that there are potentially serious ramifications to the spammy nature of some monster spell effects, but I also want to point out that the "sky is falling" sentiment is a bit overblown. As a practical matter, most of the PC's on the server are not guaranteed to make their saves anyway, so the autofail on a 1 will be a meaningless change for many players -- I have been in groups in a bunch of places where parties are taking on monsters with fear effects or paralysis and all the PCs have higher than a chance of 1 for a fail. That doesn't stop them from adventuring in those places, they just modify their tactics accordingly. The only people significantly affected by this proposed change are the higher level characters that have boosted their saves high enough so as to otherwise "guaranty" the saving throw roll against lower DCs. If you were to make this change, the only thing that would really change is that these powerful characters would still have to take the same precautions they took when they were lower level -- clarity, freedom of movement, remove paralysis, remove fear, negative energy protection, death ward, etc.
Again, whether to make this change is a matter of choice, there is no "right" or "wrong" way to play this game. I think that the people advocating for the change need to temper their expectations of how much it will affect player-behavior in a positive way, and similarly those who are against the idea need to temper their forecasting-disaster fears. This will impact how players play, but similarly players will adapt just like they adapt at lower-levels.