Silver Flame potion users are not the norm. The vast majority of players don't run every quest in the four Necropolis packs on Elite. And of those who do, not all of them pay the kind of money that keeping SF potions in stock costs.
And without the SF issue, its not a terrible change. A little less Str/Con, but full clicky usage wouldn't bother me at all. Most paladins and rangers only have 14 Wis, but 15 or 16 is pretty easy to get with tomes. A player with Madstone boots probably isn't lacking in +1 and +2 Tomes.