Customers weren't interested in hybrids because GM didn't do hybrids right.
They had the Volt, a hybrid compact sedan in a market where sedans are dying. And while the technology was quite good and well done, it was expensive.
And they had the Yukon hybrid, which was a mild hybrid that got practically no fuel economy benefit over the non-hybrid Yukon, also a very expensive option. And the large SUV market isn't huge either.
So ya, a whole two models in uncompetitive segments, but apparently consumers don't want hybrids.
Meanwhile, Toyota offers hybrids in their most popular segments, like hatchbacks (Prius), compact CUV's (RAV4 and RX450h), and midsize CUV's (Highlander). And guess what, they sell. Now that they are reasonably priced, they'll probably outsell their non-hybrid xounterparts.
But, what else would you expect from GM? They have a long history of screwing this sort of stuff up.