A lot of Spurs fans online are really angry and upset with this news. Frankly (no pun intended lol), I'm surprised at the scale of just how many people are upset about this.
It is absolutely the right decision for the club to sack him. 78 points from 66 games is an appalling record and a club like Spurs should absolutely not tolerate finishing 17th, regardless of the Europa League ruin.
He can leave with his head held high that he ended your trophy drought and got you back into the Champions League. But keeping him on would not have led to any meaningful or tangible progress, in my opinion. And whilst injuries played a part in your terrible results, I'd argue he exacerbated things with his lack of rotation at times, strange substitutions, imbalanced starting line-ups and poor game management.
Thomas Frank, who looks likely to take the job now, will be much more of a threat than Postecoglou.
Your club have made the correct decision and, if Frank is backed in the transfer market, you could easily be challenging for the top-5 spots, whilst potentially going on another cup run again. I can't say for sure whether he'd succeed, but he's a good appointment that's worth the risk (assuming it does end up being him).