No mention of Vivante? I wonder if that's not their biggest threat, in the Asian market.
The only rationale I see for them buying MIPS is to build full SoCs and be a direct competitor to Qualcomm. But they didn't need MIPS to do that - it'd just be a cost-savings, since they wouldn't have to pay royalties to ARM. So, if that was their plan, they should have focused on getting that business off the ground, and then adding MIPS cores as a cost-saving option.
There's the following moonshot scenario. If their raytracing gamble pays off, and major engines add support for it, then a selling point of Imagination GPUs in Android devices would be that you could get better quality in certain mobile games. That might be enough of a selling point for them to gain traction in the Android market. Meanwhile, perhaps they could get some income licensing their raytracing IP to certain competitors.