Is anyone else of the opinion that these two restrictions in particular seem a little outdated in the current game environment? Mining Tunnels was restricted during the Morrslieb Cycle when I think there was a little bit of fear that development based mechanics were going to be too overpowered. These expectations didn't really materialize in my opinion (does anyone ever use Light of Morrslieb, or the Wood Elves in general?), and the Dwarves never really became that competitive from any new dev based mechanic that became available to them.. Further since that time I think Dwarves have definitely become one of the weaker factions in the game (which is fine, they did have their time), but I think this only further warrants Mining Tunnels removal from the restricted list.
Looking at low loyalty, 2 cost, early game supports of the other races, I don't think Mining Tunnels is that much more powerful than those for some of the other races. I think a lot of competitive players would agree that Slave Pen, One Orc's Scrap, Church of Sigmar, etc. are just as powerful. So really is there any reason why this card should prevent Dwarf players from also adding Reclaiming the Fallen or Warpstone to their decks? Since most players choose to add either of these to their Dwarf deck it speaks to which ones are actually overpowered.. Seems like the freedom to add one of these in addition to the tunnels might rekindle the Dwarf prowess.
Wilhelm on the other hand was restricted when Verena decks were in full force. The restriction didn't have much of an effect though because he tends to get in the way of Friedrich Hemmler, so players just tossed him in as a much utilized finisher instead. It wasn't till the restriction of Will of the Electors that Verena was put under control (if not crippled). I think the fact that Hemmler is such a great substitute for Wilhelm really takes away from the purpose of restricting him in the first place. If Wilhelm was removed from restriction I don't think we would see a triumphant return of Verena decks given the powerful cards that a lot of factions have been given recently (which is great IMO). Wilhelm is also such a core classic Empire unit that it really takes away from the feel of the race to have him restricted, he's pretty much the keystone card of the original theme of Empire in this game.
Regardless of the more specific arguments as to why these particular cards should be unrestricted, I think just looking at the current game as a whole, Dwarves and Empire are arguably the weakest races at the moment. So even if players embrace these cards as they did in the past it might not be such a bad thing, given what they're up against.