Until Airtel and Telkom can match Safcom's quality and coverage, I am not overly worried BUT since most Kenyans are dual SIM folks, I do see Safcom losing market share.
I have Saf (phone) for "critical" use but also use Faiba4G (modem) for normal surfing, limited to Nairobi and Mombasa, purely on a cost basis.
Greedy when others are fearful. Very fearful when others are greedy - to paraphrase Warren Buffett