(On the other hand, if you've decided that Misstep is the only thing holding you back from playing Goblin Welder, chances are pretty good that Misstep is increasing your match win rate)
Evidence that this is true--nobody is succeeding with Welder+4x Misstep. Or Crop Rotation+Misstep. The only deck which is really being Chased out by Misstep is Ritual Storm--and that less because the Ritual gets hit, but because Duress et. al. get hit, and it legitimately doesn't have the deck space to play 4x Misstep.
Honestly given all the griping, I'd rather we unrestrict some cards and live a little first, before we call for Workshops' head. Give us Merchant Scroll. Give us Windfall. Give us Imperial Seal. Or all the cantrips. Or, if we're feeling spicy, Flash. I'm pretty sure that the current iteration of blue control can beat the tar out of any blue based combo deck (short of potentially Mind's Desire, and even then), or can adapt to do so. Give blue the tools to do the dirty work of crushing Shop players more easily, and they will.
At least we'd be exploring interesting space for a bit at that point, instead of a "this sucks, please restrict".