@sasha is right this is a terrible Idea and it doesnt make sense why would safaricom be interested in brick & mortar model when the banks are currently moving away from that format.
Mpesa as a virtual bank is more cost effective than a bank, furthermore this business of venturing into a new business enterprise that differs completely from their core business is dangerous reminds me of Kodak when it ventured into chemicals and pharmaceuticals and acquired several pharmaceuticals companies thereby moving away from its core business of making film.
That was the beginning of Kodaks troubles and I think even though they sold the pharmaceutical subsidiaries,the detour must have contributed to their declining market share and lately bankruptcy.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3