If that was the case, most developers would use Java/C# for enterprise apps and call it a day. The fact is Apple presented something completely different and devs flocked. That something is losing it's shine. Disruptions will come, and developers will flock. Can Apple disrupt again? I don't know as they are a walled garden and not very openly innovative. Other companies have embraced openness which many developers care deeply about. Mindshare is not driven solely by money.
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Maybe not, but those are innovative and disrupting. If Apple came out with a modular hackable laptop/tablet, people would send the stock to the moon. That is disruption and openness. If they tore down just a bit of the walled garden, people would reward them. Instead we have secrecy and closed systems. No real cloud story. No real hardware innovation.