Their stores aren't big enough for that vision of the game cafe/etc. The average Gamestop is tiny as fuck.
These are all good ideas for what they could have done. Trying to push out those initiatives now though, in their darkest hour with no cash? Has there ever been any retailer that's been able to pivot the entire business model for so many stores across the country and come back swinging? Blockbuster sure couldn't do it, Sam Goody, Toys-R-Us, etc. Even if they had capable management I don't think they could retrofit all their stores before they went under.
Radio Shack is the last one that springs to mind. They spent a ton of money completely revamping stores/changing inventory/etc. They had a vision of people coming in to try stuff/etc. It was a risk that didn't pay off...the customers didn't come, and the customers they did have previously turned away because it wasn't the same store anymore. They shuttered about a year after the change (although that 80s Super Bowl commercial was awesome).
I worked at EB, which eventually was gobbled up and assimilated by Game Stop, but I did notice that Game Stop more or less had the same model.
Pushing preowns and trade-ins and other sell-ups. The margins on preowns was massive. Even in the early 2000s, EB was pushing preowns hard. Until I left, they kept raising and raising goals for preown sales. I recall they wanted more than half of all sales in the store to be preowned. Tradein prices were pretty low back then as well. For an AAA title that just came out that cost $49.99, you could probably expect maybe $30 tops for trade in. Everything else was usually half retail new, with trade in prices plummeting pretty fast on titles after a few weeks. The preown price was usually on average $5 less than new.
"Protection plans" first started with consoles, then they eventually expanded into games. They were one of the few things the employees actually got commission on. It was something like 20% when I was there. So there was a stronger incentive to upsell that if you're making barely above minimum wage. Then they also had a few upsell items you would make commission on, like those Game Doctor "scratch remover" things.
But preowns were the bread&butter and basically propped up their business for the past 20 years. Console companies and developers -hated- the after market, but until recently, couldn't really do much about it. Attempts at protection in the past had strong resistance. I forgot, was it Microsoft or Sony that had announced limited physical game sharing with friends and that blew the fuck up in their face, so their rival said "lol you can share" and forced the other to back down. A move to a pure digital format, that cuts out the middle man, has been their dream. It hasn't been until recently, with improvements in store and internet speeds, that is has slowly become a reality. Consoles were the last bastion of the preowned market place. If that erodes/goes away, then the whole business model of Gamestop is fucked. Not only do you lose out on aftermarket sales, but you also become less relevant for physical sales as well.
Trying to turn Gamestop into a Newbury Comics or some Pseudo-Arcade isn't going to turn their fortunes around. I do agree that they need to diversify and have a revenue stream in a post-aftermarket world, but the time to do that was years ago, not on the doorstep of bankruptcy.
edit: Lol it was Xbox that had the restrictive sharing, then Sony made this epic response that completely nuked Microsoft's model