GME has a very hard uphill battle if they're going to compete with Steam. You're talking about a platform that has been around for almost 20 years where users have massive collections of games and marketable items.

GME also known for ripping people off. Not sure they're moving in the right direction. As an avid PC gamer I don't see myself investing any time or money in to any platform they come out with.

Also to mention they'll be competing not only with Steam, but Epic Game Store, BattleNet, Origin, UPlay, Battlestate. None of which compete with Steam when it comes to market share.