1. There may be some decks that may not benefit from adding allies. The first one that comes to my mind is Darkclaw with Lone Wolf. Having said that, there are heroes who can run 10 allies (more or less) in deck to a considerable degree of success (eg: Jericho, Baduruu, Gwenny). So my answer is yes and no. It all depends on the hero and its card pool.
2. Yes. You should consider solo as an archetype of the game while balancing the game. I am sure with some love from the DT many unviable heroes at this point may be able to work in future. Also, if you are thinking of not designing cards to support solo heroes, it might not be a very wise decision since you have already made cards that fit in the archetype.
Solo should be a thing. It adds another layer of depth in the game.
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