Compared to a hypothetical scenario where developers care to build iPad apps? No.
I don't think the availability of iPhone apps on iPad is what derailed development of iPad apps either, practically all the ROI building software for Apple hardware comes from impulse spending on the iPhone and even with 500+ million iPads in circulation today it doesn't come close.
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Compared to having even less software? Yes.
Compared to a hypothetical scenario where developers care to build iPad apps? No.
I don't think the availability of iPhone apps on iPad is what derailed development of iPad apps either, practically all the ROI building software for Apple hardware comes from impulse spending on the iPhone and even with 500+ million iPads in circulation today it doesn't come close.